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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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...