arXiv Daily: Nickelate Superconductors

arXiv Daily: nickelate superconductors 2026-05-19

Tue, 19 May 2026 10:37:57 +0800

Daily Overview: Dear readers, today’s rapid overview of the nickel-based superconductivity field presents a core research advance: using ultralow-temperature scanning tunneling microscopy/spectroscopy, researchers have for the first time observed an energy-symmetric flat-bottomed U-shaped superconducting gap in (La,Pr)₃Ni₂O₇ thin films, confirming its nodeless gap nature. This gap exhibits zero density of states at extremely low temperatures, evolves into a V-shape as temperature increases, and is suppressed by magnetic fields, behaving consistently with conventional superconducting gaps. This discovery reveals a new mechanism for high-temperature superconductivity in double-layer nickelates, offering insightful clues for achieving even higher-temperature superconductivity under ambient or zero pressure. Apart from this closely related paper, the remaining articles do not involve nickel-based superconductivity.

arXiv Daily: Nickelate superconductors 2026-05-16

Sat, 16 May 2026 10:14:28 +0800

Daily Overview: Today’s research in the field of nickelate superconductivity is characterized by a robust trend of experimental deepening and theoretical unification. On the experimental front, a study combining atomic-resolution scanning tunneling microscopy with spectroscopy has, for the first time, directly observed a nodeless U-shaped superconducting gap in (La,Pr)₃Ni₂O₇ superconducting thin films. It also reveals that precise control of oxygen content is an essential prerequisite for obtaining intrinsic spectra, providing key evidence for understanding the pairing symmetry of superconductivity. At the theoretical level, an important paper proposes a unified framework of “shear-stress-constrained superconductivity,” insightfully pointing out that non-hydrostatic pressure or epitaxial strain themselves are not the direct cause of superconductivity; rather, the key lies in the local Ni-O framework constraint deformation achieved through shear stress. This scenario offers a cross-scale unified quantitative perspective for understanding the fragility, heterogeneity, and reproducibility challenges of superconducting behavior in both high-pressure bulk and thin-film systems. Additionally, this week’s submissions also include several studies on strongly correlated electron systems closely related to superconductivity, such as a dynamical scaling analysis of the pseudogap-to-Fermi-liquid quantum critical point in the two-dimensional Hubbard model, and an ultrafast spectroscopy study of the rapid decoupling between quasiparticles and spin fluctuations in superconducting cuprates. These works, in mutual reflection with core issues in the nickelate field, collectively advance the understanding of unconventional superconductivity and strongly correlated electronic states.

arXiv Daily: Nickelate superconductors 2026-05-15

Fri, 15 May 2026 10:08:33 +0800

Daily Overview: Today, there are no directly related new paper preprints on the field of nickelate superconductors. However, several works in this issue focus on superconductivity, strongly correlated electron systems, and unconventional pairing mechanisms, which are highly relevant to the core scientific questions of nickelate superconductors. For example, [1] presents direct evidence of quantum critical spin fluctuations in the strange metal phase of cuprates via nuclear magnetic resonance, and its spatial inhomogeneity and electronic phase separation characteristics offer valuable insights for understanding analogous phenomena in nickelates. [3] discovers a strongly correlation-driven Nagaoka supermetal state in the triangular-lattice Hubbard model; its sublinear resistivity behavior and band renormalization mechanism provide a new perspective for exploring non-Fermi liquid behavior in nickelates. [8] systematically analyzes superconducting pairing symmetries in multiorbital systems using the exactly solvable Hatsugai-Kohmoto model, offering a theoretical framework for understanding orbital-selective pairing in nickelates. [11] and [15] investigate symmetry-driven topological superconducting states in altermagnets and spin-filtering and nonreciprocal transport in altermagnet/Ising superconductor junctions, respectively; these synergistic effects of spin-orbit coupling and superconductivity are instructive for designing nickelate-based heterostructures. Although these studies do not directly address nickelates, the strongly correlated physics, pairing symmetries, and interface effects they reveal are expected to provide important references for exploring the mechanism and functional applications of nickelate superconductors.

arXiv Daily: Nickelate superconductors 2026-05-14

Thu, 14 May 2026 10:19:14 +0800

Daily Overview: Today’s rapid overview of the nickelate superconductor field focuses on an important review work. A collaborative team from Nankai University and Zhejiang University has systematically summarized the experimental progress of superconducting bilayer nickelate thin films (RA₃Ni₂O₇) under ambient pressure. The review points out that La₃Ni₂O₇ and (La,Pr)₃Ni₂O₇ thin films grown on substrates such as SrLaAlO₄ via epitaxial strain have achieved superconducting onset temperatures exceeding 40 K, successfully reproducing the key structural features of high-pressure bulk materials under ambient conditions. However, the maximum superconducting transition temperature in current thin films remains lower than that of high-pressure bulk materials, indicating room for optimization. The article discusses synthesis methods, oxygen stoichiometry control, substrate-induced strain, normal-state transport behavior, and doping phase diagrams, while identifying several unresolved key issues, including the reproducibility of phase-pure ultrathin films, the microscopic origin of the two-step superconducting transition, the roles of oxygen defects and substrate doping, the Fermi surface crossing position of the Ni 3d(_{z^2}) (\gamma) band, and the pairing symmetry. This work provides a controllable platform for understanding the microscopic mechanism of nickel-based superconductivity and clarifies the direction for future establishment of quantitative relationships among crystal structure, orbital reconstruction, and superconductivity. Only this one paper is featured today, but its content encompasses the latest experimental landscape and core challenges in the field.

arXiv Daily: Nickelate superconductors 2026-05-13

Wed, 13 May 2026 10:14:58 +0800

Daily Overview: Dear readers! Today marks an important theoretical advancement in the field of nickel-based superconductivity. Paper [1] systematically reveals the orbital-selective Fermi surface reconstruction driven by electronic correlations in the bilayer nickel oxide La₃Ni₂O₇, using cluster perturbation theory and density matrix renormalization group methods: under weak coupling, superconductivity is dominated by interlayer spin-singlet pairing from the d_{z²} orbital, while under strong coupling it transitions to dominance by the d_{x²-y²} orbital, yet always maintaining an s± pairing structure. This discovery elucidates the mechanism connecting the disappearance of the γ pocket with superconductivity, providing a key microscopic picture for understanding the origin of high-temperature superconductivity in this system. > Additionally, Paper [3] focuses on rare-earth nickelates RNiO₃, proposing a multi-orbital model that uniformly describes charge, spin, orbital, and lattice degrees of freedom, predicting a nonmagnetic charge-orbital ordered insulating phase induced by the Jahn-Teller effect. This provides a theoretical basis for explaining the anomalous experimental phenomenon where the metal-insulator transition temperature is higher than the magnetic ordering temperature in small-bandwidth systems. > This issue also includes other cutting-edge works in superconductivity and condensed matter physics, such as the transverse magnetic response of orbital-polarized Cooper pairs in elemental superconductors, the origin of apparent double Tc in anisotropic phase models, Ginzburg-Landau theory for confined superconducting thin films, and long-range magnetic coupling mediated by superconductivity, for your reference.

arXiv Daily: Nickelate superconductors 2026-05-12

Tue, 12 May 2026 10:39:04 +0800

Daily Overview: Although today’s daily paper overview does not directly include works related to nickelate superconductors, it covers several highlights closely tied to unconventional superconductivity, topological superconductivity, and strongly correlated electron systems, offering multidimensional perspectives for understanding superconducting pairing mechanisms and quantum state manipulation. Key highlights include: 《(BaS)₁/₃TaS₂》 achieves bulk two-dimensional Ising superconductivity with both high transition temperature and large interlayer spacing, breaking traditional trade-offs through a chain-intercalation strategy; 《d-wave altermagnets》 reveals that d-wave altermagnets can stabilize finite-temperature pair density wave phases without an external magnetic field; 《cuprate superconductivity》 uses first-principles three-band modeling to confirm the indispensability of long-range hopping for the superconducting dome and pairing symmetry in cuprates; 《twisted bilayer cuprates》 predicts topological superconducting states with Chern numbers up to ±8 under electron doping in a weakly interacting Hubbard model; 《Majorana bound states》 provides an analytical framework for Majorana modes hosted by skyrmion-vortex pairs in chiral ferromagnet-superconductor heterostructures. Additionally, the discovery of the three-dimensional bipartite quantum spin liquid candidate material KBa₃Ca₄Cu₃V₇O₂₈, and the successful decoupling of RuO₂ surface electronic states from bulk states, provide important experimental foundations for studying novel quantum states in correlated electron systems.

arXiv Daily: Nickelate superconductors 2026-05-11

Mon, 11 May 2026 14:06:30 +0800

Daily Overview:

Today’s Quick Overview of the Ni-Based Superconductor Field > Among today’s submissions, no research papers directly targeting nickel-based superconductors were found. However, several works have made important progress in closely related directions such as superconducting mechanisms, strongly correlated electron systems, and topological superconductivity, offering potential insights for nickel-based superconductor research: > 1. Cuprate Superconductivity Theory: A work systematically studying the three-band Emery model via the dynamical vertex approximation (DA) is noteworthy. The study points out that traditional simplified models are insufficient for quantitatively describing the cuprate superconducting phase diagram; instead, the full set of long-range hopping parameters derived from first principles must be included to obtain a superconducting dome (doping range 7–22%) and d-wave order parameter consistent with experiments. Given the electronic structure similarities between nickel-based superconductors and cuprates, this methodology has direct reference value for theoretical modeling of nickel-based superconductors. > 2. Topological Superconductivity in Twisted Bilayer Hubbard Model: A study using the variational cluster approximation investigates topological superconductivity in twisted cuprate bilayers. It reveals that in the weak-interaction regime below the Mott transition, the electron-doped side can realize nontrivial topological superconducting states with Chern numbers up to ±8, while the hole-doped side remains topologically trivial. This microscopic mechanism provides a theoretical framework for exploring possible topological phases in nickel-based superconductors. > 3. Pair-Density Wave in Altermagnets: A non-perturbative Monte Carlo study reveals that d-wave altermagnets can stabilize finite-momentum superconductivity (pair-density wave) without requiring an external magnetic field. This originates from the momentum-dependent spin splitting, which effectively enhances pairing at finite center-of-mass momentum while suppressing the uniform superconducting channel. This mechanism offers a new perspective for understanding possible incommensurate superconducting orders in nickel-based superconductors. > 4. Theory of Majorana Bound States: An analytical theoretical work on chiral ferromagnet–superconductor heterostructures clarifies the crucial role of spin-orbit coupling for the existence of Majorana zero modes and provides the threshold condition for the spin-orbit coupling strength. These results have theoretical guiding significance for designing topological quantum computing platforms based on nickel-based superconductors. > Summary: Although no studies directly targeting nickel-based superconductors were submitted today, theoretical advances in directions such as multi-orbital models for cuprates, topological superconductivity in twisted bilayers, and pair-density waves in altermagnets provide important inspiration for refined modeling, topological state exploration, and understanding of unconventional superconducting mechanisms in nickel-based superconductor systems, meriting the attention of researchers in the field.

1. Breaking the Trade-off: Bulk 2D Ising Superconductivity with High Tc and Giant Interlayer Spacing via a Unique Chain Intercalation in (BaS)1/3TaS2

Relevance Score: 4.3582
Authors: Ziyi Zhu, Leiming Chen, Xiangqi Liu, Haonan Wang, Chen Xu, Ze Yan, Zhengyang Li, Wei Xia, Jiawei Luo, Na Yu, Xia Wang, Ke Qu, Zhenzhong Yang, Yanfeng Guo
Affiliations: East China Normal University, ShanghaiTech University, Zhengzhou University of Aeronautics
Link: http://arxiv.org/abs/2605.07336v1

Summary: This paper reports the synthesis of a new polymorph, (BaS)₁/₃TaS₂, via a unique chain-like intercalation strategy, which successfully overcomes the long-standing trade-off between high superconducting transition temperature (Tc) and increased interlayer spacing/enhanced two-dimensionality in conventional intercalation systems. In this structure, Ba-S-S-Ba chains are inserted between TaS₂ bilayers, forming locally decoupled two-dimensional superconducting layers with an interlayer spacing of 12.75 Å, more than three times that of pristine 2H-TaS₂. This structural configuration breaks the bulk c-axis mirror symmetry, significantly suppresses interlayer electronic coupling, and renders local inversion symmetry breaking within individual TaS₂ layers dominant, thereby avoiding the compensation of the Ising spin–orbit field in the centrosymmetric bulk and realizing robust bulk two-dimensional Ising superconductivity. Comprehensive transport, magnetic, and thermodynamic measurements confirm that (BaS)₁/₃TaS₂ exhibits an enhanced Tc, an in-plane upper critical field far exceeding the Pauli limit, and pronounced superconducting anisotropy, demonstrating the successful coexistence of high Tc with large interlayer spacing/high two-dimensionality. This work establishes a generic intercalation framework for designing bulk two-dimensional Ising superconductors, offering a new route to reconcile competing demands in materials and expanding the scope of Ising superconductivity research.

arXiv Daily: Nickelate superconductors 2026-05-08

Fri, 08 May 2026 13:45:18 +0800

Daily Overview: No relevant papers have been published in the field of nickel-based superconductivity today.

1. Pair-Breaking and Dimensionality in Spin-Orbit Coupled Superconductors

Relevance Score: 4.5787
Authors: Reiley Dorrian, Mizuki Ohno, Elena Williams, Adrian Llanos, Joseph Falson
Link: http://arxiv.org/abs/2605.06514v1

Summary: This paper employs the multi-mechanism Kharitonov-Feigel’man (KF) framework to analyze the thickness-dependent superconductivity in spin-orbit-coupled superconducting thin films of LaBi₂, and systematically compares it with the conventional Klemm-Luther-Beasley (KLB) model. A series of high-quality single-crystal films ranging from the “bulk” to the ultrathin limit (2.1 nm) were prepared by molecular beam epitaxy, and the temperature-dependent upper critical fields were measured under parallel magnetic fields. In contrast to the KLB model, which only considers paramagnetic pair-breaking, the KF framework simultaneously incorporates three mechanisms: orbital pair-breaking, paramagnetic effects, and magnetic scattering (spin-exchange scattering). An anomalous enhancement of the critical field was observed in the ultrathin limit (2.1 nm), attributed to the suppression of magnetic fluctuations by the magnetic field, which effectively reduces the spin-exchange scattering rate. Through fitting with the KF model, the contributions of each scattering channel were successfully isolated: the magnetic scattering time is on the order of 10⁻¹²–10⁻¹¹ seconds, while the KLB model, due to its neglect of orbital pair-breaking, severely overestimates the spin-orbit scattering time (by up to four orders of magnitude) at finite thickness and is meaningful only in the zero-thickness limit. The study also reveals differences among three distinct definitions of the zero-field critical temperature (experimental value, KLB extrapolated value, and KF value without magnetic impurities), and emphasizes that the determination of the Pauli limit should be extrapolated to the strictly two-dimensional limit. The results indicate that the KLB model, by ignoring magnetic disorder and orbital effects, introduces systematic biases in the interpretation of fundamental superconducting parameters (such as critical temperature and Pauli limit), whereas the KF framework provides a more accurate deconstruction of pair-breaking mechanisms in two-dimensional superconductors, offering new insights into the relationship between scattering times and superconductivity.

arXiv Daily: Nickelate superconductors 2026-05-07

Thu, 07 May 2026 13:02:12 +0800

Daily Overview: Today’s research highlights in the field of nickelate superconductors focus on the regulation of oxygen content in the La₃Ni₂O₇₊δ system. A collaborative team from the Chinese Academy of Sciences, Hainan University, Sun Yat-sen University, and other institutions successfully isolated pure bilayer phases, hybrid 1212 phases, and triple-layer intergrowth phases with different structures by precisely controlling the oxygen content. They found significant differences in superconducting transition temperatures—the pure bilayer phase reaches approximately 83.5 K, while the triple-layer intergrowth phase only exhibits 4–6 K. The study also established a phase diagram showing the evolution of Tc and upper critical field Hc₂ with oxygen content, revealing the decisive influence of oxygen content on the intergrowth structure of Ruddlesden-Popper phases and superconducting properties. This work provides key experimental evidence for understanding the high-temperature superconducting mechanism and synthesis control of La₃Ni₂O₇₊δ.

arXiv Daily: Nickelate superconductors 2026-05-06

Wed, 06 May 2026 20:00:00 +0800

Daily Overview: Today’s overview of the nickelate superconductor field focuses on magnetic studies of bilayer La₃Ni₂O₇ single crystals. Using neutron scattering techniques, this work, for the first time under ambient pressure, clarifies the spin excitation energy gap, in-plane anisotropic dispersion, and bilayer periodic modulation in this material, directly confirming the existence of interlayer antiferromagnetic coupling. A bilayer Heisenberg model based on stripe-type magnetic order successfully describes the experimental dispersion and reveals that its spin-wave bandwidth is only about 25% of that in cuprates, yet the total fluctuating magnetic moment at comparable energies is similar to that in cuprates, establishing a magnetic framework distinct from cuprates. These results provide key constraints on the magnetic order and spin dynamics for understanding the possible high-temperature superconductivity mechanism in bilayer nickelate systems.

arXiv Daily: Nickelate superconductors 2026-05-05

Tue, 05 May 2026 20:13:28 +0800

Daily Overview: Here is the English translation of the provided Chinese daily paper overview: > — > Today’s Research Overview in the Nickelate Superconductor Field > Two research works today deepen our understanding of the superconducting mechanism in layered nickel oxides from the perspectives of structural and electronic phase transitions, as well as the relationship between electronic ordered phases and superconductivity. > First, a team from Université Paris-Saclay and other institutions systematically mapped the temperature-pressure phase diagram of the bilayer nickelate La₃Ni₂O₇ using high-pressure high-temperature Raman and infrared spectroscopy. They discovered that a pressure-induced lattice tilt-to-untilt structural phase transition is accompanied by a nearly two-order-of-magnitude increase in carrier concentration, and superconductivity is observed near the phase boundary. This work establishes a direct link between structural and electronic property changes, providing a key experimental foundation for understanding its high-pressure superconducting mechanism. > Meanwhile, another study led by Brookhaven National Laboratory and other institutions focuses on bilayer nickelate La₂PrNi₂O₇ thin films. Using resonant X-ray scattering and spectroscopy, they provide strong evidence that the spin density wave (SDW) is not a precursor state of superconductivity but rather a competing phase associated with oxygen vacancies. The work further proposes that in the superconducting phase, regions with intact oxygen stoichiometry have a ground state characterized by robust interlayer five-spin polaron states, which lock out-of-plane orbitals and render the in-plane orbital behavior close to the classical electronic configuration of cuprates and infinite-layer nickelates. > In summary, these studies not only elucidate the structural origin of pressure-driven superconductivity but also reveal the key regulatory role of oxygen stoichiometry in electronic states and the superconducting/competing phase balance, offering new perspectives for exploring the microscopic mechanism of nickelate superconductivity.

arXiv Daily: Nickelate superconductors 2026-05-01

Fri, 01 May 2026 20:00:00 +0800

Daily Overview: Based on the list of papers you provided, no research papers directly focusing on nickel-based superconductivity as the core topic were found in today’s overview. Therefore, in accordance with your requirements, a related overall introduction cannot be generated this time.

1. Dimensionality-Driven Electronic and Orbital Transitions Mediating Interfacial Magnetism in LaNiO3/CaMnO3 Observed In Situ

Relevance Score: 4.9295
Authors: B-A. Courchene, A. Hampel, S. Beck, J. R. Paudel, J. D. Grassi, L. A. Lapinski, A. M. Derrico, M. Terilli, M. Kareev, C. Klewe, A. Gloskovskii, C. Schlueter, S. K. Chaluvadi, F. Mazzola, I. Vobornik, P. Orgiani, J. Chakhalian, A. J. Millis, A. X. Gray
Affiliations: University of California, Berkeley, Lawrence Berkeley National Laboratory, DESY, Temple University, AREA Science Park, Rutgers University, CNR-IOM, Cornell University, Università degli Studi di Padova, Columbia University, Flatiron Institute
Link: http://arxiv.org/abs/2604.28054v1

Summary: This study systematically investigates the modulation of interfacial magnetism by dimension-driven electronic and orbital transitions in LaNiO₃/CaMnO₃ superlattices through a combination of in-situ synthesis, polarization-dependent angle-resolved photoelectron spectroscopy, X-ray magnetic circular dichroism, and first-principles electronic structure calculations. It is found that reducing the LaNiO₃ thickness to the ultrathin limit triggers a metal-insulator transition, accompanied by the disappearance of electronic coherence and a crossing of orbital polarization (enhanced in-plane d_x²-y² orbital occupancy). These changes weaken charge transfer at the interface and suppress the interfacial magnetic moment of Mn in CaMnO₃, indicating that the interfacial ferromagnetic state is directly governed by the electronic confinement of LaNiO₃. Density functional theory combined with dynamical mean-field theory successfully reproduces the insulating state and orbital reconstruction. This work confirms a direct and tunable coupling among electronic, orbital, and magnetic degrees of freedom in oxide heterostructures, providing a new pathway for designing correlated electron behavior in nanoscale spintronic materials.

arXiv Daily: nickelate superconductors 2026-04-30

Thu, 30 Apr 2026 20:00:00 +0800

Daily Overview: This post sorts papers by relevance to nickelate superconductors. Summaries are AI-generated and may contain errors.

1. Dimensionality-Driven Electronic and Orbital Transitions Mediating Interfacial Magnetism in LaNiO3/CaMnO3 Observed In Situ

Relevance Score: 4.9640
Authors: B-A. Courchene, A. Hampel, S. Beck, J. R. Paudel, J. D. Grassi, L. A. Lapinski, A. M. Derrico, M. Terilli, M. Kareev, C. Klewe, A. Gloskovskii, C. Schlueter, S. K. Chaluvadi, F. Mazzola, I. Vobornik, P. Orgiani, J. Chakhalian, A. J. Millis, A. X. Gray
Link: http://arxiv.org/abs/2604.28054v1

Summary: Emergent magnetic states at oxide interfaces arise from the interplay of charge transfer, orbital reconstruction, and dimensional confinement, offering a route to engineered correlated-electron behavior in nanoscale spintronic materials. Here, we combine in situ synthesis, polarization-dependent angle-resolved photoelectron spectroscopy, X-ray magnetic circular dichroism, and first-principles electronic-structure calculations to investigate LaNiO3/CaMnO3 superlattices. We show that reducing the LaNiO3 thickness drives a metal-insulator transition accompanied by loss of electronic coherence and an orbital-polarization crossover in the ultrathin limit. These changes weaken charge transfer across the interface and suppress the interfacial Mn magnetic moment in CaMnO3, revealing that the emergent ferromagnetic state is directly governed by electronic confinement in LaNiO3. The insulating state and orbital reconstruction are reproduced by density functional theory combined with dynamical mean-field theory. Together, these results establish a direct and tunable coupling among electronic, orbital, and magnetic degrees of freedom in oxide heterostructures.

arXiv Daily: nickelate superconductors 2026-04-29

Wed, 29 Apr 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s daily overview of the nickelate superconductor field. The highlight of today focuses on a deeper understanding of the electronic structure of hybrid Ruddlesden-Popper nickelates. In [1], a theoretical study using the DFT+DMOT method reveals that the monolayer-bilayer alternating structure of La₅Ni₃O₁₁ exhibits distinctly different electronic behaviors under ambient pressure. Specifically, the monolayer Ni ions display an orbital-selective Mott insulating state, while the bilayer Ni ions exhibit strongly correlated quasiparticle behavior, with magnetic correlations predominantly governed by the bilayer. This work unveils the critical role of confinement effects and orbital-dependent correlations in determining the physical properties of nickel-based superconductors. Additionally, several other studies in today’s overview are worth noting: - [2] A high-pressure study of the cluster Mott insulator GaNb₄Se₈ demonstrates the evolution from “wavefunction collapse” to superconductivity, providing an ideal platform for understanding pressure-induced Mott transitions in correlated systems. - [3] Proposes a scheme to achieve high-temperature superconductivity on the surface of Weyl semimetals by engineering Van Hove singularities. This interface-enhanced superconductivity mechanism parallels the approach of exploring superconductivity in nickelate thin-film interfaces and is highly inspiring. - [8] Realizes a programmable superconducting diode effect in the nematic superconductor FeSe, demonstrating a method to manipulate the superconducting state by controlling nematic domains. This offers new tuning dimensions and technical paradigms for the study of nickel-based superconductors that exhibit similar electronic correlations and nematic order. The above direct research on nickelates, along with physically related work, constitutes the core content of today’s overview.

arXiv Daily: nickelate superconductors 2026-04-24

Fri, 24 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlight work focuses on the controllable experimental realization of multi-orbital models in strongly correlated electron systems, which is highly relevant to the current pursuit of understanding complex electronic structures in the field of nickel-based superconductivity. In [1], the researchers propose a novel architecture based on ultracold fermions and optical superlattices, successfully realizing the three-band Emery model—a core theoretical framework for describing the low-energy physics of cuprate and nickel-based superconductors. By precisely tuning orbital-dependent interactions and charge transfer energies, and combining quantum walk experiments with quantum Monte Carlo simulations, this work observes, for the first time in an undoped system, a finite-temperature metal-insulator crossover and the consequent emergence of antiferromagnetic correlations, which bears a profound analogy to the electronic correlation behavior in nickel-based superconducting parent compounds. Furthermore, the Hamiltonian learning protocol developed in this study can invert experimental data to extract an effective single-band Hubbard model, providing a novel methodology for resolving effective low-energy models in future multi-orbital nickelate systems. Although the remaining papers do not directly target nickelates, their investigations into strong-coupling superconductivity theory, electron-phonon coupling dynamics, and interface defect engineering also offer valuable references for frontier issues such as the ambient-pressure pairing mechanism, excitonic effects, and interface engineering in nickel-based superconductivity. arXiv submission processing window: 2026-04-23 20:33 to 2026-04-24 18:58 UTC.

arXiv Daily: nickelate superconductors 2026-04-23

Thu, 23 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], X-ray absorption spectroscopy and resonant inelastic X-ray scattering studies on (La,Pr)₃Ni₂O₇₋δ thin films reveal that both strain and oxygen content modulation lead to the delocalization of the oxygen 2p₂ orbital and the nickel 3d₂² orbital, while long-range spin density wave order is significantly suppressed, and short-range magnons remain robust, indicating that orbital delocalization and short-range magnetic fluctuations are prerequisites for superconductivity. [2] provides a theoretical analysis of the 1313-phase La₃Ni₂O₇, pointing out that its superconductivity primarily originates from a three-layer subsystem with s^{±}-wave pairing symmetry, but the single-layer subsystem, acting as a weakly connected layer forming S-N-S Josephson junctions, suppresses the global transition temperature. This work thus deduces that the 2222-phase, rather than the 1313-phase, is the true host of high-temperature superconductivity in the RP-phase La₃Ni₂O₇ family. These two studies deepen the understanding of the superconducting mechanism in nickelates from experimental and theoretical perspectives, respectively. arXiv submission processing window: 2026-04-22 20:37 to 2026-04-23 18:00 UTC.

arXiv Daily: nickelate superconductors 2026-04-22

Wed, 22 Apr 2026 20:00:00 +0800

Daily Overview: The highlight of today’s work focuses on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a review systematically elaborates on the strong-coupling Hund’s rule-assisted pairing mechanism in bilayer La₃Ni₂O₇, pointing out that the strong interlayer antiferromagnetic exchange mediated by the inner apical oxygen of the 3d_z² orbital cooperates with the itinerant nature of the 3d_x²-y² orbital, forming effective interlayer pairing via Hund’s coupling, which drives extended s-wave superconductivity. Meanwhile, localized ladder singlets give rise to a pseudogap phase, providing a unified theoretical framework for high-temperature superconductivity in this system. Additionally, although several other papers do not directly investigate nickelates, the physical mechanisms they explore are highly relevant to the core issues currently addressed in nickel-based superconductivity. For example, [3] discovers a parity-breaking charge density wave and pairing density wave in kagome metals, offering new perspectives for understanding quantum geometry and pairing symmetry in unconventional superconductors. In [12], perfect spin non-reciprocity is achieved in superconducting alternating magnetic heterostructures, with its momentum-selective filtering strategy inspiring spin transport manipulation in nickel-based heterojunctions. Meanwhile, [7] manipulates van Hove singularities in antimony telluride superlattices via layer-number control, providing a tunable pathway for driving correlated quantum states through dimensionality engineering in nickelates. These advancements collectively deepen the understanding of electron correlations, symmetry, and pairing mechanisms in strongly correlated superconducting systems. arXiv submission processing window: 2026-04-22 00:02 to 2026-04-22 19:31 UTC.

arXiv Daily: nickelate superconductors 2026-04-21

Tue, 21 Apr 2026 20:00:00 +0800

Daily Overview: Greetings readers, welcome to today’s overview of papers in the nickel-based superconductivity field. Although no works directly targeting nickelates as the research subject are included today, multiple papers focus on physical mechanisms closely related to the core issues of nickel-based superconductivity. Among them, [1] decomposes the pseudogap in cuprates via nuclear magnetic resonance shift, proposing three condensation rules for spin-singlet pairing, thereby providing a unified framework for understanding the electronic phase diagram of layered oxide superconductors. [13], based on real-space Ginzburg-Landau analysis, explores the inversion symmetry breaking and chirality induced by four-layer charge density waves in the Kagome superconductor CsV₃Sb₅, with conclusions that are relevant to similar possible CDW order in nickelates. [20] introduces hidden hyperuniform disorder into the Hubbard model, revealing the high sensitivity of electronic states and magnetic phase transitions in correlated systems to ordered microstructures, offering new insights into the regulation of disorder effects in nickelates. arXiv submission processing window: 2026-04-20 20:00 to 2026-04-21 18:14 UTC.

arXiv Daily: nickelate superconductors 2026-04-20

Mon, 20 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a review systematically summarizes experimental and theoretical progress on RP-phase nickel oxide superconductors, emphasizing that ultra-thin La₃Ni₂O₇ films grown on compressively strained substrates achieve ambient-pressure superconductivity, enabling experimental techniques such as angle-resolved photoemission spectroscopy. Theoretically, the Ni e_g and a_{1g} orbitals and the interlayer dimer picture are highlighted as key factors. In [3], density matrix renormalization group simulations of a three-leg t-J ladder with strong inter-chain coupling reveal that pair correlation functions exhibit power-law decay near 1/3 hole doping, forming asymmetric pairing compared to electron doping, providing numerical evidence for understanding the electronic properties of trilayer nickelate superconductors. These works collectively advance the understanding of the microscopic mechanism of nickel-based superconductivity. arXiv submission processing window: 2026-04-19 20:01 to 2026-04-20 19:34 UTC.

arXiv Daily: nickelate superconductors 2026-04-19

Sun, 19 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on the pairing mechanism of the bilayer nickelate La₃Ni₂O₇ high-temperature superconductor, revealing that a unified framework based on the “gene principle” and the “cooperative Fermi surface rule” can be naturally extended to this bilayer multi-orbital system. Two dominant antiferromagnetic superexchange channels cooperatively generate a stable s± superconducting state, offering new perspectives for understanding the unique electronic environment of nickel-based superconductivity. Additionally, although not directly targeting nickelates, today’s list includes studies on the G-type antiferromagnetic order and hidden altermagnetism in Rb₁₋ₓV₂Te₂O, as well as the microscopic detection of hidden magnetic entropy in the orbital glass state of Ba₂NaOsO₆. The physical mechanisms explored in these studies—such as spin-orbit coupling, hidden order, and d-wave spin splitting—are closely related to the core issues currently addressed in the field of nickel-based superconductivity, including pairing symmetry, spin fluctuations, and orbital effects, warranting cross-disciplinary attention. arXiv submission processing window: 2026-04-19 00:56 to 2026-04-19 18:01 UTC.

arXiv Daily: nickelate superconductors 2026-04-18

Sat, 18 Apr 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s briefing on research in the nickel-based superconductivity field. Although today’s list lacks studies directly targeting nickelates, several works have made significant progress in areas such as low-dimensional electronic states, topological phase transitions, charge density waves, and altermagnetism. These topics share potential methodological and physical connections with issues currently central to nickel-based superconductivity, such as dimensionality-driven electronic reconstruction, strong correlation effects, and symmetry breaking. Highlights include: the observation of layer-dependent topological phase transitions in WTe₂ thin films, demonstrating how dimensionality regulates band topology through interlayer coupling; the first discovery of a fourfold-periodic charge density wave in isolated NbS₃ single chains, revealing deviations from Luttinger liquid behavior in truly one-dimensional systems; a symmetry-guided transport fingerprint identification route established via the screening of altermagnetic materials; the significant influence of in-plane anisotropy on the magneto-optical properties of FePS₃, illustrating strong structure-optics coupling; and the confirmation of the Berry phase origin of topological transport in polycrystalline FeSi thin films, along with an estimation of the Weyl point separation. These works advance the understanding of low-dimensional and topological quantum states from multiple perspectives, offering valuable insights for exploring the mechanisms of nickel-based superconductivity. arXiv submission processing window: 2026-04-18 04:23 to 2026-04-18 18:36 UTC.

arXiv Daily: nickelate superconductors 2026-04-17

Fri, 17 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of mixed Ruddlesden–Popper nickelates. In [1], the researchers developed an ultrafast magneto-pressure spectroscopy platform capable of operating simultaneously under conditions of up to 40 GPa, a 7 T magnetic field, and temperatures as low as 5 K. This platform was applied to systematically probe the quasiparticle dynamics in the trilayer nickelate Pr₄Ni₃O₁₀. The experiments revealed a pronounced critical slowing down of quasiparticle relaxation near the charge density wave (CDW) transition, which disappeared upon applying pressure. At higher pressures, however, the low-temperature relaxation time increased, exhibiting features characteristic of incipient superconducting correlations. Notably, a magnetic field of up to 7 T had almost no effect on the relaxation behavior, and no vortex-induced pre-bottleneck dynamics were observed. This indicates that any possible superconducting state under the current pressure conditions is not bulk-like, but rather filamentary or strongly inhomogeneous. This work not only provides a new experimental approach to unraveling the competition between superconductivity and intertwined orders in nickelates, but also opens up an important avenue for understanding the microscopic origin of pressure-induced superconductivity. arXiv submission processing window: 2026-04-17 01:12 to 2026-04-17 19:06 UTC.

arXiv Daily: nickelate superconductors 2026-04-16

Thu, 16 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the superconducting mechanism in bilayer Ruddlesden-Popper nickelates. [1] By stabilizing (La,Pr)₃Ni₂O₇ superconducting thin films and combining X-ray absorption with resonant inelastic X-ray scattering, it was directly observed that superconductivity emerges only when the out-of-plane d_{z²}-p_z-d_{z²} interlayer hybridization becomes coherent, accompanied by the suppression of static spin order and strongly damped spin excitations. This reveals a microscopic picture in which interlayer orbital hybridization and correlation strength jointly shape the superconducting window. Meanwhile, [12] although not directly targeting nickelates, its discovery in the two-dimensional Fermi-Hubbard model of a universal magnetic energy scale J* that decreases linearly with doping, and uniformly determines the spin stiffness, bimagnon frequency, and the onset temperature of the pseudogap, provides a key theoretical framework for understanding the connection between doped antiferromagnetism and the pseudogap in nickel-based superconductors. arXiv submission processing window: 2026-04-15 20:10 to 2026-04-16 19:47 UTC.

arXiv Daily: nickelate superconductors 2026-04-15

Wed, 15 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. One study systematically reveals the evolution of the pressure required for the superconducting phase with bandwidth and filling in the bilayer nickelate La₃Ni₂O₇ family by partially substituting La with Nd to alter NiO₆ octahedral tilting, thereby reducing bandwidth, and simultaneously introducing Sr for hole doping to regulate band filling. The study also identifies multiple characteristic resistance anomalies in the non-superconducting state, which may correspond to charge density wave and spin density wave orders competing with superconductivity, indicating that independently controlling bandwidth and filling is crucial for understanding the unconventional superconducting mechanism and its competing orders in this system. arXiv submission processing window: 2026-04-15 02:58 to 2026-04-15 19:49 UTC.

arXiv Daily: nickelate superconductors 2026-04-14

Tue, 14 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on several physical mechanisms indirectly related to the field of nickel-based superconductivity. Although no papers directly address nickelates, multiple studies explore topics highly relevant to the current core issues in nickel-based superconductivity: [9] investigates the kinetic arrest of the Mott phase transition in V₂O₃, offering new insights into the Mott insulator background and strain modulation in nickelates; [10] systematically calculates the superconducting transition temperature near the two-dimensional van Hove singularity using quantum Monte Carlo methods, revealing the crossover between weak-coupling BCS theory and strong-coupling preformed pairs, which is of reference value for similar Fermi surface topology effects potentially present in nickelates; [2] demonstrates the coupling transitions of structural, mechanical, and electronic properties through thickness-tuning of rippled strain gradients in perovskite oxide thin films, with strain engineering approaches that can inspire stress design in nickelate thin films. Additionally, [1] on magnetic modulation in Ni-doped two-dimensional ferromagnets, [3] on spin transport in altermagnet-superconductor junctions, and [4] on exotic residual phases in chiral superconductors all exhibit potential intersections with the research directions of nickel-based superconductivity at the levels of superconducting pairing, spin-related effects, or topological states. arXiv submission processing window: 2026-04-14 03:53 to 2026-04-14 18:00 UTC.

arXiv Daily: nickelate superconductors 2026-04-13

Mon, 13 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of hybrid Ruddlesden–Popper nickelates. One study [1] systematically analyzed the Raman response of superconducting multi-orbital systems using electronic Raman scattering, with nickelates as an application target. It revealed unique fingerprint features in Raman spectra for different pairing symmetries (d-wave, s±-wave, s-wave) and model structures (single-layer/bilayer, single-orbital/two-orbital), and pointed out that full multi-orbital calculations are crucial for capturing inter-orbital hybridization effects, providing key theoretical tools for clarifying the minimal model and gap symmetry of nickelate superconductivity. Additionally, [10] investigated the microscopic mechanism of photo-resonance enhanced pair correlations in K₃C₆₀, identifying symmetry-constrained two-photon paths to provide independent support for a purely electronic mechanism underlying photo-induced superconducting pair formation. This mechanism may have generality in moderately coupled Hubbard systems and offers insights for exploring photo-controlled pairing in nickelate superconductors. [13] focused on anomalous conductive behavior at step edges of topological metal surfaces, revealing non-integer quantized conductance determined by the bulk Weyl node spacing and step orientation. This bulk–edge correspondence provides a new perspective for understanding the relationship between disorder and transport in topological materials, and offers useful references for the interplay between edge states and bulk superconductivity in unconventional superconductors. arXiv submission processing window: 2026-04-13 04:45 to 2026-04-13 19:38 UTC.

arXiv Daily: nickelate superconductors 2026-04-12

Sun, 12 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlighted work focuses on the study of physical mechanisms closely related to the field of nickel-based superconductivity. Although no papers directly addressing nickelates were present, several studies provided important insights into core topics such as quantum criticality, d-wave pairing, and magnetic order. [1] Using optical low-temperature experiments, the electrodynamics of disordered NbN, granular Al, and the heavy-fermion compound CeCoIn5 were systematically investigated, revealing Higgs modes, Goldstone modes, and hidden Fermi liquid behavior in quantum critical superconductors. These phenomena are directly related to possible quantum critical points and unconventional pairing mechanisms in nickel-based superconductivity. [2] Spin-resolved photoemission spectroscopy clarified the magnetic controversy in RuO₂, indicating surface ferrimagnetism rather than altermagnetism, providing a comparative case for understanding the influence of oxygen coordination environments on magnetism in nickel-based superconductors. [3] A universal design principle for vacancy-driven two-dimensional d-wave altermagnets was proposed, characterizing the symmetry of d-wave spin splitting, which is consistent with the symmetry of d-wave pairing in nickel-based superconductors. This design approach may inspire the exploration of similar electronic structure reconstructions in nickel-based superconducting systems. [4] The competition between disorder and interactions in quantum Hall systems was systematically studied, revealing the transition from fractional quantum Hall liquids to Wigner crystals. The concept of the many-body phase diagram can provide an analogy for the competition between charge order and superconductivity in nickel-based superconductors. These works deepen the understanding of quantum phenomena related to nickel-based superconductivity from various perspectives. arXiv submission processing window: 2026-04-12 12:58 to 2026-04-12 18:34 UTC.

arXiv Daily: nickelate superconductors 2026-04-11

Sat, 11 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on the decoupling behavior of the pseudogap and superconductivity in copper oxide superconductors under high pressure, as well as predictions of the electronic structure of strongly coupled multiband two-dimensional superconductors. Although this issue does not directly include original research on nickelates, the pressure-driven separation of the pseudogap onset temperature and gap amplitude in cuprate superconductors, the phenomenological model of the universal metallic state, and the discovery of multiband strong-coupling superconductivity in hexagonal BP₃ monolayers are all highly relevant to core issues currently of interest in nickelate superconductivity, such as pairing mechanisms, gap structures, and electron-phonon coupling. These findings provide valuable physical insights and theoretical approaches for understanding the superconducting state in nickelates. arXiv submission processing window: 2026-04-10 20:38 to 2026-04-11 18:22 UTC.

arXiv Daily: nickelate superconductors 2026-04-10

Fri, 10 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. [1] Using scanning transmission electron microscopy combined with electron energy-loss spectroscopy, it was revealed that the formation of the superconducting phase in La₃Ni₂O₇₋δ thin films is closely related to oxygen stoichiometric homogeneity, epitaxial strain, and specific stacking polytypes, establishing a theoretical framework in which oxygen content, lattice strain, and structural ordering collectively regulate the metastable superconducting phase. Meanwhile, [2] a continuous linear increase in the superconducting transition temperature under high pressure was achieved in freestanding infinite-layer Nd₀.₈₅Sr₀.₁₅NiO₂ thin films, rising from 17 K at ambient pressure to approximately 74 K without saturation. This pressure evolution behavior is distinctly different from the overdoping suppression observed in cuprates and bilayer nickelates, indicating that the pairing strength in infinite-layer nickelates can be significantly enhanced by lattice compression. Furthermore, [3] pressure-induced superconducting transitions observed in the d-wave altermagnetic candidate material CsV₂Se₂O, following an evolution path from a weakly insulating parent phase through electronic reconstruction to strange metal transport and superconducting behavior, are highly similar to the common characteristics of unconventional superconductors such as cuprates and nickel oxides, providing a cross-reference for understanding possibly universal electronic state transitions in nickel-based superconductivity. arXiv submission processing window: 2026-04-09 20:00 to 2026-04-10 18:31 UTC.

arXiv Daily: nickelate superconductors 2026-04-09

Thu, 09 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on the electronic structure, superconducting mechanism, and material properties of bilayer Ruddlesden-Popper nickelate superconductors. In [1], the three-dimensional band structure of (La,Pr,Sm)₃Ni₂O₇ thin films was resolved using low-temperature ARPES, revealing orbital-dependent dimensionality and a superconducting gap driven by the dz² orbital (2Δ/kBTc~8), emphasizing the critical role of the third dimension. [2] attributed the two-step superconducting transition in La₂PrNi₂O₇₋δ thin films to granular superconductivity through transport and structural characterization, pointing to oxygen inhomogeneity as the primary factor limiting zero-resistance temperature. [3] used D-TRILEX many-body theory to find that competition between multiorbital and nonlocal correlations in the normal state of bilayer nickelates can form spin-polaron bound states, providing a new explanation for the controversy over ARPES spectral features. [4] employed variational Monte Carlo methods to obtain an orbital-selective d-wave superconducting state in a two-band t-J model, indicating that the quasi-localized dₓ²⁻y² orbital competes with superconductivity, and suppressing its participation may enhance Tc. These works deepen the understanding of nickelate superconductivity from both experimental and theoretical perspectives. arXiv submission processing window: 2026-04-08 23:37 to 2026-04-09 19:57 UTC.

arXiv Daily: nickelate superconductors 2026-04-08

Wed, 08 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlight work focuses on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a study based on cluster dynamical quantum Monte Carlo method reveals how a vertical electric field significantly modulates the superconducting pairing symmetry of the bilayer nickelate La₃Ni₂O₇: the electric field induces a transition from s±-wave to d-wave pairing symmetry by suppressing the s±-wave pairing derived from the d_{z²} orbitals, driving interlayer d_{z²} orbital mismatch, and promoting electron transfer to the d_{x²-y²} orbitals. The d-wave pairing strength exhibits a distinctive dome-shaped behavior as a function of the electric field. This large-scale many-body calculation provides a key microscopic picture for understanding the superconducting mechanism of RP nickelates and points to a new direction for manipulating nickel-based superconducting pairing states via electric fields. arXiv submission processing window: 2026-04-07 20:49 to 2026-04-08 18:48 UTC.

arXiv Daily: nickelate superconductors 2026-04-07

Tue, 07 Apr 2026 20:00:00 +0800

Daily Overview: The highlight of today’s work focuses on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a study based on DFT+singular mode functional renormalization group method reveals the critical role of interlayer Ni-Ni distance in governing the ground-state phase diagram of La3Ni2O7/LaAlO3 thin films: a shorter interlayer distance tends to form C-type spin density wave (with ferromagnetic interlayer coupling), a longer interlayer distance leads to G-type spin density wave (with antiferromagnetic interlayer coupling), while the intermediate region stabilizes an s±-wave superconducting state dominated by Ni 3d₃z²⁻ʳ² orbital pairing. This theoretical picture successfully explains the experimental observation of superconductivity in thin films under ambient pressure and predicts that applying pressure will suppress the superconducting transition temperature, ultimately entering a C-type spin density wave. If experimentally verified, this prediction would strongly reveal the itinerant electron nature of electronic correlations in this system, as the C-type spin density wave naturally emerges in the itinerant picture but is difficult to realize in the localized magnetic moment picture. arXiv submission processing window: 2026-04-06 21:27 to 2026-04-07 17:55 UTC.

arXiv Daily: nickelate superconductors 2026-04-06

Mon, 06 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure and superconducting pairing mechanism in mixed Ruddlesden-Popper nickelates. [1] Using RIXS technique, the collective spin excitations in trilayer nickelate La₄Ni₃O₁₀ were systematically analyzed. It was found that the magnetic excitation bandwidth is comparable to that of bilayer systems but with lower spectral weight. Combined with linear spin-wave modeling, the study reveals stronger three-dimensional magnetism and the critical impact of reduced electronic correlations on magnetic evolution, providing new perspectives on the magnetism-superconductivity correlation within the family. [2] Meanwhile, multimodal terahertz spectroscopy was employed to study (La,Pr)₃Ni₂O₇ thin films. From both linear and nonlinear responses, the superconducting pairing symmetry (s±-wave) and normal-state pseudogap features were extracted simultaneously. It was also pointed out that the superconducting state coexists and competes with another ordered state, providing important experimental constraints for understanding the unconventional mechanism of nickel-based superconductivity. arXiv submission processing window: 2026-04-06 01:39 to 2026-04-06 18:00 UTC.

arXiv Daily: nickelate superconductors 2026-04-05

Sun, 05 Apr 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s curated overview of papers in the nickel-based superconductivity field. Although no studies directly focusing on nickelates were published today, multiple papers address physical mechanisms highly relevant to the core issues in nickel-based superconductivity, warranting attention. [1] By decoupling the contributions of electrons and phonons to the superconducting transition temperature in hydrides, it is revealed that the electronic component dominates superconductivity and is governed by parameters such as bond length and electron localization function. This analytical approach can be directly transferred to the trade-off between electronic correlations and electron-phonon coupling in nickelates. [2] Using quantum Monte Carlo methods to study the optical SSH model on a triangular lattice, an s-wave superconducting phase is found at three-quarter filling. This result provides important insights for understanding the electron-phonon coupling-induced superconducting pairing mechanism in nickelates, particularly regarding kinetic frustration effects on non-bipartite lattices. [4] d-wave altermagnetism is realized in orthorhombically twisted bilayer CrPS₄, and the mechanisms of spin splitting and symmetry breaking offer a new perspective for exploring the possible coexistence of altermagnetic order and superconductivity in nickel-based superconductors. [5] A structure–property framework for decoherence in superconducting qubits is proposed, and its method of decoupling microstructure topology from geometric coupling provides methodological inspiration for controlling quantum coherence in nickelate thin films and heterostructures. These works enrich our understanding of the coupling among superconductivity, spin, and lattice in strongly correlated electronic systems from various angles, and are expected to provide new theoretical tools and experimental directions for nickel-based superconductivity research. arXiv submission processing window: 2026-04-05 04:07 to 2026-04-05 15:33 UTC.

arXiv Daily: nickelate superconductors 2026-04-04

Sat, 04 Apr 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s overview of papers in the nickel-based superconductivity field. While today’s list does not directly include studies on nickelate superconductors, [1] the work on interface and strain-tuned Weyl semimetal phases in SrNbO₃/LaFeO₃ heterostructures, and [4] the discovery of true pairing density waves in kagome lattices, both involve physical mechanisms (such as octahedral distortions and non-zero momentum pairing) that are highly relevant to core issues in the current nickel-based superconductivity research, and thus deserve attention. arXiv submission processing window: 2026-04-03 23:26 to 2026-04-04 18:14 UTC.

arXiv Daily: nickelate superconductors 2026-04-03

Fri, 03 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. A key study employed time-resolved optical spectroscopy to reveal two high-energy electronic excitations in La₃Ni₂O₇ and their corresponding distinct density wave gaps, while elucidating the complex coupling behavior between phonons and electronic excitations, providing direct spectroscopic evidence for understanding many-body effects and the gap structure in this system. Additionally, several highly relevant studies from other systems offer insights into key physical issues underlying nickelate superconductivity. For example, the microscopic correlation between Mott insulator physics and Kondo hybridization observed in d-electron kagome lattices, and the anomalous phonon thermal Hall effect discovered in altermagnets, provide important references for exploring similar physical phenomena that may exist in nickelates from the perspectives of strongly correlated electronic states and novel magnetic excitations, respectively. arXiv submission processing window: 2026-04-03 01:38 to 2026-04-03 19:11 UTC.

arXiv Daily: nickelate superconductors 2026-04-02

Thu, 02 Apr 2026 20:00:00 +0800

Daily Overview: Today’s highlight focuses on the in-depth understanding of the electronic structure of hybrid Ruddlesden-Popper nickelates. [1] Using resonant inelastic X-ray scattering, a direct comparison of the electronic and magnetic excitations between trilayer La₄Ni₃O₁₀ and bilayer La₃Ni₂O₇ was conducted. It was found that the trilayer compound exhibits weaker electronic correlations and interlayer magnetic exchange, which explains why its superconducting transition temperature of approximately 30 K is significantly lower than that of the bilayer (~80 K), establishing interlayer magnetic coupling and electronic correlations as key parameters. [2] First-principles calculations revealed the strain tuning mechanism in La₃Ni₂O₇ thin films, demonstrating that biaxial compressive strain enhances the Jahn-Teller splitting energy as the core microscopic factor for optimizing superconductivity. The calculated results are consistent with experiments. These works provide important experimental and theoretical evidence for understanding the superconducting pairing mechanism in layered nickelates. arXiv submission processing window: 2026-04-01 22:40 to 2026-04-02 19:26 UTC.

arXiv Daily: nickelate superconductors 2026-04-01

Wed, 01 Apr 2026 20:00:00 +0800

Daily Overview: The highlights of today’s work focus on an in-depth exploration of electronic structures and pairing symmetries in the field of nickel-based superconductivity. In [1], a theoretical design based on DFT+DMFT proposes that the cobalt-based layered compound La₄Co₂NiO₈Cl₂ exhibits strongly correlated electronic characteristics highly similar to those of superconducting La₄Ni₃O₁₀, including non-Fermi liquid behavior in the outer Co orbitals and flat bands near the M point, providing a theoretical candidate for the search of new cobalt-based high-temperature superconductors. In [2], researchers systematically calculated the electronic Raman response using a two-orbital bilayer model, indicating that Raman scattering can effectively distinguish between s±-wave and nodal d-wave pairing symmetries in bilayer nickelate La₃Ni₂O₇. In particular, the low-energy power-law behavior can clearly identify nodal states, offering a powerful means for experimentally determining the superconducting gap structure. Furthermore, [3] reports the observation of superconductivity at 16.3 K in the altermagnetic candidate material Na₂₋ₓV₂Se₂O. Its layered structure serves as a structural bridge between cuprates/nickelates and iron-based superconductors, expanding the correlated superconducting material system and providing valuable insights for understanding unconventional superconducting mechanisms. arXiv submission processing window: 2026-03-31 22:24 to 2026-04-01 17:59 UTC.

arXiv Daily: nickelate superconductors 2026-01-16

Fri, 16 Jan 2026 20:00:00 +0800

Daily Overview: Today’s paper overview does not directly target nickelate superconductors, but several studies have made key progress in superconducting pairing mechanisms, the coexistence of electronic liquid-crystal order and superconductivity, and methodology for strongly correlated surface states—all closely related to the unconventional superconducting mechanisms and layered structure issues currently of interest in the nickel-based superconductor field. In [1], Norman explains the anisotropic superconducting gap of KTaO₃ heterojunctions based on the Slater soft mode, emphasizing the importance of cooperative multi-phonon-mode pairing and providing an analogy for the role of electron-phonon coupling in nickel-based superconductivity. In [2], Butler et al. observe short-range electronic nematic order coexisting with superconductivity in NaAlSi; the spatial modulation of its superconducting gap suggests a possible intertwining of nematic order and superconducting order, similar to that in nickel-based superconductors. In [6], Klebl et al. propose a surface functional renormalization group method that offers an efficient numerical tool for treating strong correlations on the surfaces of quasi-two-dimensional nickelate systems and reveals that interlayer coupling can induce novel ordered phases beyond those in purely two-dimensional models. These results advance the understanding of unconventional superconductivity and its associated correlated electronic states from various perspectives. arXiv submission processing window: 2026-01-15 20:18 to 2026-01-16 19:16 UTC.

arXiv Daily: nickelate superconductors 2026-01-15

Thu, 15 Jan 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s overview of the latest papers in the field of nickelate superconductivity. Although the highlight works of today do not directly focus on nickelates, multiple papers are highly relevant to the core issues in the nickelate superconductivity field in terms of mechanisms, methods, or phenomena, making them worthy of close attention. For example, [5] reveals the critical role of correlated hopping interactions in driving superconducting phase transitions, providing a theoretical framework for understanding possible non-local correlation effects in nickelates; [11] proposes microwave Kerr/Faraday resonance as a sensitive probe for detecting time-reversal symmetry breaking in chiral superconductors, a technique that can be extended to the study of pairing symmetry in nickel-based superconductors; [12] reports the coexistence of magnetic and multipole orders and their constraints on superconducting pairing in CeRh₂As₂, offering analogies to the competition between spin fluctuations and superconductivity in nickelates; [14] uncovers multi-scale dynamic modulation structures in SrTiO₃, where lattice instability shares physical similarities with charge order and lattice coupling in nickelates; [15] constructs a theory of composite Bogoliubov Fermi liquids, providing a new paradigm for unconventional superconductivity in Chern bands, which may inspire theoretical exploration of topological superconducting states in nickelates. These works expand the understanding of strong correlations and unconventional superconductivity from different dimensions, offering research ideas and tools that can be applied to the nickelate superconductivity field. arXiv submission processing window: 2026-01-14 20:07 to 2026-01-15 18:50 UTC.

arXiv Daily: nickelate superconductors 2026-01-14

Wed, 14 Jan 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. [1] Polarization-resolved infrared spectroscopy reveals strong electrodynamic anisotropy induced by density-wave order in La₄Ni₃O₁₀, where the out-of-plane conductivity is sharply suppressed. The spin-density-wave order drives a redistribution of Ni-dz² orbital occupancy, effectively decoupling the Ni-O layers and significantly enhancing the two-dimensionality of the system. Additionally, [6] Monte Carlo simulations revisit the Jahn-Teller transition in correlated oxides, revealing that systems including layered nickelates (e.g., NaNiO₂) exhibit displacement-type transition characteristics. The behavioral differences between perovskites and layered nickelates arise from variations in lattice configurational entropy, offering new perspectives for understanding the structure-property relationships in nickelates. These two studies collectively advance the knowledge of electronic states and lattice dynamics in nickel-based superconductors and related systems. arXiv submission processing window: 2026-01-13 21:48 to 2026-01-14 19:00 UTC.

arXiv Daily: nickelate superconductors 2026-01-13

Tue, 13 Jan 2026 20:00:00 +0800

Daily Overview: In today’s overview of papers on nickel-based superconductivity, there is no study directly centered on nickelates, but a theoretical work on graphene superconductivity is closely related to current hot topics in nickel-based superconductivity. Using the self-consistent Bogoliubov–de Gennes method, this work reveals how the “kinetic blocking” mechanism in strain-engineered graphene leads to the formation of quasi-one-dimensional filamentary structures of the superconducting order parameter at geometric nodes, presenting a pairing density wave state with sign reversal. This mechanism provides a theoretical framework for understanding the recently observed filamentary superconductivity in nickelate thin films, indicating that strain gradients can achieve spatial selectivity of the superconducting state by decoupling internal degrees of freedom, thereby expanding our understanding of quantum phase modulation with geometric origins. arXiv submission processing window: 2026-01-12 22:51 to 2026-01-13 19:32 UTC.

arXiv Daily: nickelate superconductors 2026-01-12

Mon, 12 Jan 2026 20:00:00 +0800

Daily Overview: Today’s highlight work is focused on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a systematic study using soft X-ray absorption spectroscopy tracked the topotactic reduction process of PrNiOₓ thin films from the perovskite to the infinite-layer structure. By combining Ni L-edge and O K-edge spectroscopy with cluster model calculations, it was revealed that none of the samples exhibit a pure d⁹ configuration; even in the superconducting state, significant hole doping is present, and oxygen 2p holes persist. This result directly challenges previous assumptions regarding the hole doping limit and indicates that the self-doping effect, together with oxygen non-stoichiometry, leads to a complex hole doping mechanism, providing key experimental constraints for understanding the electronic ground state of nickelate superconductivity. arXiv submission processing window: 2026-01-12 01:00 to 2026-01-12 18:44 UTC.

arXiv Daily: nickelate superconductors 2026-01-11

Sun, 11 Jan 2026 20:00:00 +0800

Daily Overview: Hello readers, welcome to today’s rapid overview of papers in the nickel-based superconductivity field. Although no paper directly focuses on nickelates today, several works are highly relevant to the core issues currently under investigation in this field, from perspectives such as superconducting pairing mechanisms, interface physics, and materials preparation. Among them, [3] systematically studies the FFLO superconducting states driven by two types of alternating magnetic order—(d_{xy}) and (d_{x^{2}-y^{2}})—in two-dimensional lattices, revealing the stabilization conditions over a wide parameter range at low fillings, providing theoretical clues for exploring possible finite-momentum pairing in nickel-based superconductors. [1] reviews mechanisms such as Ising pairing and superconductor/ferromagnet proximity effects in van der Waals superconducting electronics; the concepts of interfacial tunability and nonreciprocal transport discussed therein offer insights for understanding interface superconductivity in nickelate heterostructures. [5] definitively rules out magnetic order in RuO₂ using X-ray linear dichroism, and this conclusion also holds methodological reference value for clarifying the controversy over spin configurations in nickelates. Additionally, [4] presents the epitaxial synthesis and electronic structure characterization of metastable TaO₂ thin films, demonstrating stabilization strategies for oxide metastable phases, which may provide process inspiration for phase engineering of nickelate thin films. Collectively, these works enrich the physical and materials understanding relevant to nickel-based superconductivity from different perspectives. arXiv submission processing window: 2026-01-10 20:02 to 2026-01-11 18:19 UTC.

arXiv Daily: nickelate superconductors 2026-01-10

Sat, 10 Jan 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s overview of the latest papers in the field of nickel-based superconductivity. The highlight of today’s work focuses on a deeper understanding of the electronic structure of hybrid Ruddlesden–Popper nickelates. In [1], a theoretical study employing a molecular orbital basis to treat the quarter-filled bilayer system reveals the emergence of Kugel–Khomskii physics and predicts a novel maximal spin-layer entangled phase, providing a specific theoretical framework for understanding composite entanglement in bilayer nickelate superconductors. Additionally, [5] investigates the coexistence of superconductivity and charge density waves (CDW) in correlated systems using the Green’s function method, exploring the impact of next-nearest-neighbor hopping on competition—a topic closely related to the interplay between CDW and superconductivity in nickel-based superconductors, and thus worthy of attention. arXiv submission processing window: 2026-01-09 21:54 to 2026-01-10 17:32 UTC.

arXiv Daily: nickelate superconductors 2026-01-09

Fri, 09 Jan 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on several studies that, while not directly addressing nickelates, investigate physical mechanisms highly relevant to core issues in nickel-based superconductivity. Among them, the research on Jahn-Teller effect-driven lifting of molecular orbital degeneracy and orbital liquid state in NbSeI provides a microscopic picture for understanding the coupling between orbital order and structural distortion in nickelates. The coexistence of Cr-kagome flat bands and Yb-4f correlated flat bands in YbCr₆Ge₆ offers an important analogy for the mechanism of superconductivity driven by hybridization between wide and narrow bands in nickelates. Meanwhile, the symmetry engineering design of perovskite altermagnets provides methodological insights for controlling magnetoelectric coupling in nickel-based heterostructures. Collectively, these works expand the understanding of the origin of unconventional superconductivity in correlated electron systems from the perspectives of electronic correlations, orbital physics, and symmetry control. arXiv submission processing window: 2026-01-08 20:22 to 2026-01-09 19:29 UTC.

arXiv Daily: nickelate superconductors 2026-01-08

Thu, 08 Jan 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s research highlights in the nickel-based superconductivity field. Although none of the papers in today’s list directly focus on nickelate superconductors, several studies are highly relevant to the core issues currently facing nickel-based superconductivity, particularly in terms of electronic structure, superconducting mechanisms, and computational methods. Among them, RIXS studies on the local electronic structure of Ni²⁺ in the pyrochlore antiferromagnet NaCaNi₂F₇ reveal that its octahedral environment is highly robust against A-site disorder, allowing comparisons to the electronic structure stability of the NiO₂ planes in nickel-based superconductors in terms of such local effects. Research on the condensation mechanism of cuprate superconductors reveals bosonic statistical characteristics of strong coupling between pairon excitations and the condensate, and the proposed picture of an energy-dependent gap proportional to the spin-exchange energy may provide insights into understanding similar spin-fluctuation-mediated pairing in nickelates. The discovery of chiral topological order on the surface of the cluster Mott insulator Nb₃Br₈ and its explanation of the zero-field diode effect suggest that surface states in layered correlated systems can give rise to topological superconducting phases under weak correlations, echoing possible interfacial superconducting mechanisms in nickel-based superconductor thin films. Furthermore, the hDMFT method, which achieves full five-orbital DMFT calculations for Ba₂IrO₄ and Ba₂RhO₄, significantly reduces computational costs and provides a feasible pathway for future multi-orbital correlated calculations involving the full d manifold in nickelates. arXiv submission processing window: 2026-01-08 03:40 to 2026-01-08 19:07 UTC.

arXiv Daily: nickelate superconductors 2026-01-07

Wed, 07 Jan 2026 20:00:00 +0800

Daily Overview: In today’s paper overview, although no studies directly focusing on nickelates were reported, multiple works are highly relevant to the core issues in nickel-based superconductivity in terms of physical mechanisms and research methods. Among them, [2] demonstrates, through the La₁₋ₓCeₓFeSiH solid solution system, how Kondo entanglement between 3d and 4f correlated electrons finely tunes the competition and coexistence of superconductivity and magnetic order, providing a valuable paradigm for understanding the interaction between nickel 3d and rare-earth 4f electronic states in nickelates. [4] theoretically extends the fluctuation conductivity theory in the ultra-clean limit to multicomponent superconductors, clarifying gauge invariance and critical behavior; its analytical framework for transport signals in multiband systems has direct reference value for nickel-based multiband superconductors. Furthermore, the topological nodal-line superconducting phase realized by coupling in-plane ferromagnetism with conventional s-wave superconductivity in [1], along with the mechanism of band tilting and nodal structure generation, offers new insights for exploring similar topological superconducting states in nickel-based heterostructures. Together, these works enrich the research perspectives on superconducting mechanisms and quantum phase control in correlated electron systems. arXiv submission processing window: 2026-01-07 02:11 to 2026-01-07 19:00 UTC.

arXiv Daily: nickelate superconductors 2026-01-06

Tue, 06 Jan 2026 20:00:00 +0800

Daily Overview: Based on the list of papers you provided, today’s daily overview does not include studies directly focused on the field of nickelate superconductors. However, several works discuss physical mechanisms or research methods highly relevant to the core issues currently concerning nickelate superconductivity, making them worthy of attention. The following is the overall introduction prepared for today’s post: — Dear readers, welcome to today’s daily overview of the field of nickelate superconductors. Although the highlighted works today do not directly study nickelates, they focus on key topics such as superconducting pairing mechanisms, electron-phonon coupling modulation, nematic orbital anisotropy, and the competition between charge density waves and superconductivity, providing important references for understanding nickelate superconductivity. For example, [1] proposes interlayer charge-transfer ferroelectric fluctuations as a pairing mechanism for van der Waals superconductors; [2] significantly enhances the superconducting transition temperature of A15-type LaH5.75 via Ba doping; [3] real-space images orbital nematicity in iron-based superconductors using laser PEEM; [5] reveals the competition between CDW and superconductivity in Janus MoXH monolayers; [8] explores electron pairing mechanisms without phonon mediation based on a two-band model. These findings expand the understanding of unconventional superconductivity and complement the current concerns in the nickelate superconductor field regarding electronic structure, pairing mechanisms, and competing orders. arXiv submission processing window: 2026-01-05 21:10 to 2026-01-06 19:28 UTC.

arXiv Daily: nickelate superconductors 2026-01-05

Mon, 05 Jan 2026 20:00:00 +0800

Daily Overview: Today’s highlight focuses on a deeper understanding of the electronic structure of mixed Ruddlesden–Popper nickelates. In [1], a study using polarization-resolved ultrafast spectroscopy reveals electronic nematicity with broken twofold rotational symmetry at low temperatures in bilayer La₃Ni₂O₇, while the trilayer La₄Ni₃O₁₀ remains isotropic. This finding suggests a potential link between nematic fluctuations and high-pressure superconducting pairing. Additionally, the study of the Ruddlesden–Popper double perovskite oxide Sr₃Co₂O₇ in [5] proposes a mechanism for charge-disproportionation-driven polar antiferromagnetic metal, a model that may provide insights into the synergy between layered structure and electronic correlations in nickelates. arXiv submission processing window: 2026-01-05 00:23 to 2026-01-05 19:00 UTC.

arXiv Daily: nickelate superconductors 2026-01-04

Sun, 04 Jan 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s rapid overview of papers in the nickel-based superconductivity field. Although no studies directly targeting nickelates are included today, the work in [1] on the orbital separation between charge order and superconductivity in the cuprate La₂₋ₓSrₓCuO₄ is highly relevant to ongoing discussions in the nickel-based superconductivity field regarding multi-band electronic structure competition. That study, employing X-ray spectroscopy and c-axis uniaxial pressure, found that compressional strain drives an orbital separation between superconductivity (originating from the d_{x²-y²} state) and charge order (gradually shifting to the d_{z²} channel), suggesting that similar multi-order coexistence in nickel oxide superconductors also requires descriptions beyond a single-band model. arXiv submission processing window: 2026-01-03 23:26 to 2026-01-04 19:16 UTC.

arXiv Daily: nickelate superconductors 2026-01-03

Sat, 03 Jan 2026 20:00:00 +0800

Daily Overview: Today’s highlights focus on multi-angle advances in superconductivity mechanisms, orbitronics, and exciton physics. Although these studies are not directly targeting nickelate superconductors, the enhanced electron-phonon coupling, orbital Hall effect in light 3d metals, and spectroscopic signatures of local exciton pair breaking involved are closely related to the pairing mechanisms, orbital manipulation, and quantum critical behavior currently of interest in nickel-based superconductivity. [1] First-principles calculations reveal that applying 12% biaxial tensile strain to the two-dimensional carbon allotrope THO-graphene can achieve a superconducting transition temperature of 45 K, providing an example of strain-tuned electron-phonon coupling. [2] The demonstration of vertical magnetization switching driven by the orbital Hall effect in the light 3d transition metal nitride VN, with an orbital torque efficiency up to -0.41, offers new insights for designing orbitronic devices. [3] Using scanning tunneling spectroscopy, subgap states induced by a single Te vacancy impurity that break exciton pairs are observed in the excitonic insulator Ta₂Pd₃Te₅, revealing atomic-scale fingerprints of local de-pairing effects. arXiv submission processing window: 2026-01-03 07:22 to 2026-01-03 08:30 UTC.

arXiv Daily: nickelate superconductors 2026-01-02

Fri, 02 Jan 2026 20:00:00 +0800

Daily Overview: Dear readers, welcome to today’s quick overview of papers in the field of nickel-based superconductivity. Although no new papers directly studying nickelates were published today, several works explore physical mechanisms highly relevant to the current core issues in nickel-based superconductivity. Among them, [1] reveals the promotion of superconducting transition temperature by nematic fluctuations in CuxTiSe₂ through elastoresistance measurements, providing a material platform for the nematic fluctuation-mediated superconducting mechanism—nematic order and its fluctuations being one of the electronic states of great interest in the nickel-based superconductivity field. Meanwhile, [4] theoretically investigates the robustness of flat-band superconductivity in kagome lattices under disorder, finding that preserving flat-band degeneracy effectively resists disorder-induced degradation. This conclusion offers insights into understanding the possible flat-band electronic structures in nickelates and their superconductivity-enhancing effects. These works enrich the physical picture closely related to nickel-based superconductivity from different perspectives. arXiv submission processing window: 2026-01-02 02:52 to 2026-01-02 17:11 UTC.

arXiv Daily: nickelate superconductors 2026-01-01

Thu, 01 Jan 2026 20:00:00 +0800

Daily Overview: In today’s paper overview, although there is no direct study on nickelate superconductors, several works explore physical mechanisms closely related to the core issues of nickel-based superconductivity. [1] analyzes the masking of the ferromagnetic quantum critical point by spin density waves in NbFe₂, providing a new experimental paradigm for understanding possible quantum critical behavior in infinite-layer nickelates. [4] constructs a unified topological phase diagram of the quantum Hall and superconducting vortex lattice states, revealing the mechanism by which Landau level mixing induces topological superconductivity in the weak-pairing limit, offering insights for designing topological phases in nickel-based superconductors. Additionally, [5] investigates the effect of electron-hole asymmetry on Δ_T noise in superconducting quantum point contacts, providing a theoretical framework for studying non-equilibrium transport at nickel-based superconducting interfaces. These works enrich the understanding of related physical phenomena from different perspectives. arXiv submission processing window: 2025-12-31 20:20 to 2026-01-01 17:44 UTC.