Paper

Daily Overview: Today’s highlighted work focuses on the significant enhancement of the phonon thermal Hall effect by density-wave order in the trilayer Ruddlesden–Popper nickelate La₄Ni₃O₁₀. The study reveals that upon the density-wave phase transition at around 140 K, the phonon thermal Hall response increases sharply: the thermal Hall angle rises from 1.5‰ at 160 K to over 6‰, and the thermal Hall resistivity exhibits a double-plateau feature. By comparing with the magnon–phonon dispersion crossing energy, it is confirmed that magnon–phonon hybridization induced by spin-density-wave order is the central mechanism behind this effect. This discovery uncovers strong spin–lattice coupling that governs phonon transport in nickelates, and suggests that such dynamic coupling may participate in suppressing antiferromagnetic order and promoting the emergence of superconductivity under high pressure through the softening of optical phonons, thereby offering a new perspective for understanding the cooperative evolution of charge, spin, and lattice degrees of freedom in unconventional superconductors. arXiv submission processing window: 2026-06-24 00:00 to 2026-06-24 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-06-24

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], functional renormalization group studies reveal that lattice symmetry is a core factor in regulating the competition between spin density wave and superconductivity in bilayer nickelate La₃Ni₂O₇, suggesting that suppressing orthorhombic distortion via uniaxial strain may achieve bulk superconductivity at ambient pressure. [2] systematically compares the strain effects in trilayer La₄Ni₃O₁₀ thin films, finding that while compressive strain can suppress density wave order, it cannot completely eliminate in-plane octahedral rotations, leading to the absence of superconductivity—highlighting a key difference between trilayer and bilayer systems. [3] reports the observation of a superconducting onset temperature of 50–70 K in oxygen-deficient nickelate thin films grown on highly reduced SrTiO₃ substrates, accompanied by a paramagnetic Meissner effect and superconducting diode effect, attributed to the synergistic interaction between the film and substrate. [4] utilizes RIXS to observe plasmon excitations for the first time in low-valence nickelate Pr₄Ni₃O₈, where strong damping and low propagation velocity reveal unique charge screening behavior, providing quantitative constraints for analogies between nickelate and cuprate superconductors. [5] systematically evaluates the delafossite structure as a competing phase of infinite-layer oxides through high-throughput first-principles calculations, identifying the La-Ni combination as the optimal thermodynamic choice and offering guidance for stabilizing the infinite-layer phase via hole doping. These works advance the understanding of nickelate superconductivity mechanisms and materials design from multiple perspectives, including symmetry, strain engineering, interface effects, electronic excitations, and phase stability. arXiv submission processing window: 2026-06-23 00:00 to 2026-06-23 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-06-23

Daily Overview: Today’s highlighted work focuses on the theoretical study of magnetic configurations and excitation spectra in multilayer nickelates. Employing a multi-orbital itinerant electron model, one study systematically analyzes bilayer and trilayer nickelate systems, revealing the fine structure of their magnetic ground states and the characteristics of transverse-mode spin excitations. The findings show that, although the double-stripe order has a slightly lower energy in the bilayer system, the excitation spectrum of the single-stripe state qualitatively agrees with resonant inelastic X‑ray scattering and neutron scattering experiments. More importantly, the study identifies that spin-density-wave states with different interlayer mirror symmetries possess distinct interlayer optical excitation modes. This provides a clear criterion for distinguishing hidden magnetic ordered configurations in multilayer nickelates via magnetic excitation probes and supports a common itinerant origin of their magnetism. arXiv submission processing window: 2026-06-19 00:00 to 2026-06-19 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-06-19

Daily Overview: Today’s highlight work focuses on the exploration of a peculiar superconducting phase-transition phenomenon in infinite-layer nickelates. A study has realized an “inverse superconducting transition” that exceeds the liquid‑helium cooling limit in Eu‑based infinite‑layer nickelates (EuₓNd₁₋ₓNiO₂ and EuₓPr₁₋ₓNiO₂). It is found that, through magnetic‑field tuning, the superconducting zero‑resistance state is confined to a specific window between a lower turnover temperature and a higher normal superconducting critical temperature, manifested by the fact that raising the temperature or increasing the current density can paradoxically drive the system from a resistive state into a superconducting state. This anomalous behavior is attributed to the temperature‑induced alternation in the relative strength of the Eu²⁺ 4f⁷‑related compensating effective field and the upper critical field, and is corroborated by the re‑emergence of superconductivity at very low temperatures. The discovery not only offers a new paradigm for constructing high‑temperature superconducting systems with tunable magnetic interactions, but also opens up fresh application prospects for exploring quantum phenomena that reverse thermal decoherence and for the inverse design of quantum‑phase‑transition devices. arXiv submission processing window: 2026-06-18 00:00 to 2026-06-18 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-06-18

Daily Overview: Today’s highlights center on an in-depth understanding of the electronic structure of hybrid Ruddlesden–Popper nickelates. A theoretical study on 1313-La₃Ni₂O₇ thin films reveals the critical role of strain in tuning superconductivity: compressive strain suppresses superconductivity, whereas tensile strain induces band reconstruction in the trilayer subsystem, generating a new hole-like γ pocket that can drive an s±-wave pairing state with a sign-reversed order parameter, thereby establishing design principles for achieving superconductivity at ambient pressure through strain engineering. Complementarily, another work addresses the long-standing challenge of severe spectral overlap between La 3d and Ni 2p signals in nickelate spectroscopy. By innovatively employing Ni 1s core-level hard X-ray photoelectron spectroscopy, the study successfully extracts interference-free information on charge-transfer excitations in La-based nickelates, uncovering differences in nickel–ligand hybridization strength between La₃Ni₂O₇ and Nd₃Ni₂O₇ induced by tensile strain. This advance provides a sensitive and reliable spectroscopic method for systematically disentangling the effects of strain, doping, and other factors on the electronic structure of nickelates. arXiv submission processing window: 2026-06-17 00:00 to 2026-06-17 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-06-17