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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. ...

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. ...