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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. ...

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. ...

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. ...

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. ...

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. ...

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. ...