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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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...

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. ...