Announcement date: 2026-09-08; usually generated on 2026-09-09 Beijing time No newly matched papers yesterday This does not mean arXiv had no papers yesterday. It means the papers announced yesterday did not produce an accepted match for this site's nickelate superconductors scope after relevance ranking and domain review. ...
arXiv Daily: no new papers for 2026-09-08
Daily Overview: Today’s highlighted work focuses on an in-depth understanding of the electronic structure of hybrid Ruddlesden-Popper nickelates. Two studies, based respectively on experimental spectroscopy and first-principles many-body calculations, reveal the key influence of layer configuration and Ni–O hybridization on magnetic excitations, electron–phonon coupling, and superconducting pairing symmetry. In one study, comparison of two polytypes of La3Ni2O7 and La4Ni3O10 using Ni L3-edge and O K-edge resonant inelastic X-ray scattering reveals that the electronic, magnetic, and lattice excitations of LNO-1313 and La4Ni3O10 are highly similar, whereas bilayer LNO-2222 exhibits stronger orbital polarization, weaker 3d^8L ligand-hole character, larger out-of-plane magnetic exchange, and weaker electron–phonon coupling, thus providing important experimental constraints for low-energy theoretical models of layered nickelate superconductors. The other DFT+RPA study shows that, within a full-spectrum projected model that preserves the density functional theory band structure, Ni–O hybridization significantly enhances interlayer spin fluctuations and generates a commensurate magnetic instability, thereby stabilizing a sign-changing s±-wave superconducting state. By contrast, a Wannier model that describes only the low-energy bands near the Fermi surface tends to favor d-wave pairing, indicating that the interlayer coupling and Ni–O hybridization included in a full-energy description play an important stabilizing role in theoretical predictions of the pairing symmetry of bilayer nickelates. arXiv submission processing window: 2026-09-07 00:00 to 2026-09-07 00:00 UTC. ...
arXiv Daily: nickelate superconductors 2026-09-07
Daily Overview: Today’s highlighted work focuses on a systematic study of the doping evolution of local magnetic moments in the infinite-layer nickelate (La,Sr)NiO₂. Using muon spin rotation (μSR), the authors measured a series of samples spanning from the parent compound, across the superconducting dome, to the overdoped region (Sr doping 0% ≤ x ≤ 25%). They found that, regardless of doping level, local magnetic moments undergo spin freezing on the order of tens of kelvin and enter a glassy state, with no significant anomaly observed near the superconducting onset. This indicates that the magnetism in nickelates is intrinsic and essentially unaffected by hole concentration, and that magnetism and superconductivity are largely decoupled; the underlying indirect interactions need to be understood within a multiorbital framework. arXiv submission processing window: 2026-09-04 00:00 to 2026-09-04 00:00 UTC. ...
arXiv Daily: nickelate superconductors 2026-09-04
Daily Overview: Today’s highlighted work focuses on deepening the understanding of the electronic structure of hybrid Ruddlesden–Popper nickelates. In Ref. [1], the authors combine high-pressure, high-temperature Raman spectroscopy with synchrotron infrared spectroscopy to systematically investigate the structural transition from the tilted Amam phase to the untilted Fmmm/I4mmm phase in the bilayer nickelate La₃Ni₂O₇ and the associated evolution of its electronic properties. Raman measurements confirm the pressure-driven structural transition and reveal the emergence of a Fano line shape, indicating enhanced electron–phonon coupling. High-temperature data further show that the Amam phase has an upper temperature limit in the temperature–pressure phase diagram and identify a coexistence region extending from approximately 6 GPa/400 K to 15.25 GPa/544 K. Infrared reflectivity measurements demonstrate that the carrier density increases by nearly two orders of magnitude across the structural transition, with the system evolving from a weakly metallic state into a highly metallic state, indicating strong coupling between the structural transition and electronic properties. Notably, superconductivity emerges near the boundary of the coexistence region at about 6 GPa, suggesting that although an untilted high-symmetry structure and metallicity are necessary conditions for superconductivity, they alone are not sufficient to trigger it. This provides important constraints for understanding the superconducting phase diagram of nickelates. arXiv submission processing window: 2026-09-03 00:00 to 2026-09-03 00:00 UTC. ...
arXiv Daily: nickelate superconductors 2026-09-03
Daily Overview: Today’s highlighted works focus on the effects of lattice structure, doping, and pressure on superconducting behavior in nickelate superconductors. [1] Heavily Sr-doped La₂SrNi₂O₇₋δ single crystals were synthesized for the first time by a high-pressure high-temperature flux method. At ambient pressure, they are found to possess a tetragonal I4/mmm structure and a 180° Ni−O−Ni bond angle; however, Sr doping drives the Ni-3d_z² band far away from half-filling, weakening the interlayer antiferromagnetic coupling and pairing, and no superconductivity is observed, providing important clues for understanding the conditions for superconductivity in bilayer nickelates. [2] The microscopic origin of the robust superconductivity of infinite-layer La₀.₈Sr₀.₂NiO₂ under pressure was theoretically revealed: pressure increases kinetic energy, reduces effective correlation, enhances interlayer hybridization, and induces self-doping, allowing the system to maintain d-wave pairing over a wide pressure range, while superconductivity is suppressed only in the high-pressure overdoped region. [3] Trilayer Sm₄Ni₃O₁₀₋δ single crystals were successfully synthesized; in their orthorhombic Pbca structure, the Ni−O−Ni bond angle is about 152.4°. They exhibit a density-wave order at about 180 K at ambient pressure and remain non-superconducting at 80 GPa, suggesting that the severe bond-angle deviation may hinder superconductivity. The three works clarify the key factors controlling nickelate superconductivity from the perspectives of doping, pressure, and layer number/bond angle, respectively. arXiv submission processing window: 2026-09-02 00:00 to 2026-09-02 00:00 UTC. ...
arXiv Daily: nickelate superconductors 2026-09-02