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Daily Overview: Today’s highlight work focuses on the controllable experimental realization of multi-orbital models in strongly correlated electron systems, which is highly relevant to the current pursuit of understanding complex electronic structures in the field of nickel-based superconductivity. In [1], the researchers propose a novel architecture based on ultracold fermions and optical superlattices, successfully realizing the three-band Emery model—a core theoretical framework for describing the low-energy physics of cuprate and nickel-based superconductors. By precisely tuning orbital-dependent interactions and charge transfer energies, and combining quantum walk experiments with quantum Monte Carlo simulations, this work observes, for the first time in an undoped system, a finite-temperature metal-insulator crossover and the consequent emergence of antiferromagnetic correlations, which bears a profound analogy to the electronic correlation behavior in nickel-based superconducting parent compounds. Furthermore, the Hamiltonian learning protocol developed in this study can invert experimental data to extract an effective single-band Hubbard model, providing a novel methodology for resolving effective low-energy models in future multi-orbital nickelate systems. Although the remaining papers do not directly target nickelates, their investigations into strong-coupling superconductivity theory, electron-phonon coupling dynamics, and interface defect engineering also offer valuable references for frontier issues such as the ambient-pressure pairing mechanism, excitonic effects, and interface engineering in nickel-based superconductivity. arXiv submission processing window: 2026-04-23 20:33 to 2026-04-24 18:58 UTC. ...

Daily Overview: Today’s highlights focus on an in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], X-ray absorption spectroscopy and resonant inelastic X-ray scattering studies on (La,Pr)₃Ni₂O₇₋δ thin films reveal that both strain and oxygen content modulation lead to the delocalization of the oxygen 2p₂ orbital and the nickel 3d₂² orbital, while long-range spin density wave order is significantly suppressed, and short-range magnons remain robust, indicating that orbital delocalization and short-range magnetic fluctuations are prerequisites for superconductivity. [2] provides a theoretical analysis of the 1313-phase La₃Ni₂O₇, pointing out that its superconductivity primarily originates from a three-layer subsystem with s^{±}-wave pairing symmetry, but the single-layer subsystem, acting as a weakly connected layer forming S-N-S Josephson junctions, suppresses the global transition temperature. This work thus deduces that the 2222-phase, rather than the 1313-phase, is the true host of high-temperature superconductivity in the RP-phase La₃Ni₂O₇ family. These two studies deepen the understanding of the superconducting mechanism in nickelates from experimental and theoretical perspectives, respectively. arXiv submission processing window: 2026-04-22 20:37 to 2026-04-23 18:00 UTC. ...

Daily Overview: The highlight of today’s work focuses on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a review systematically elaborates on the strong-coupling Hund’s rule-assisted pairing mechanism in bilayer La₃Ni₂O₇, pointing out that the strong interlayer antiferromagnetic exchange mediated by the inner apical oxygen of the 3d_z² orbital cooperates with the itinerant nature of the 3d_x²-y² orbital, forming effective interlayer pairing via Hund’s coupling, which drives extended s-wave superconductivity. Meanwhile, localized ladder singlets give rise to a pseudogap phase, providing a unified theoretical framework for high-temperature superconductivity in this system. Additionally, although several other papers do not directly investigate nickelates, the physical mechanisms they explore are highly relevant to the core issues currently addressed in nickel-based superconductivity. For example, [3] discovers a parity-breaking charge density wave and pairing density wave in kagome metals, offering new perspectives for understanding quantum geometry and pairing symmetry in unconventional superconductors. In [12], perfect spin non-reciprocity is achieved in superconducting alternating magnetic heterostructures, with its momentum-selective filtering strategy inspiring spin transport manipulation in nickel-based heterojunctions. Meanwhile, [7] manipulates van Hove singularities in antimony telluride superlattices via layer-number control, providing a tunable pathway for driving correlated quantum states through dimensionality engineering in nickelates. These advancements collectively deepen the understanding of electron correlations, symmetry, and pairing mechanisms in strongly correlated superconducting systems. arXiv submission processing window: 2026-04-22 00:02 to 2026-04-22 19:31 UTC. ...

Daily Overview: Greetings readers, welcome to today’s overview of papers in the nickel-based superconductivity field. Although no works directly targeting nickelates as the research subject are included today, multiple papers focus on physical mechanisms closely related to the core issues of nickel-based superconductivity. Among them, [1] decomposes the pseudogap in cuprates via nuclear magnetic resonance shift, proposing three condensation rules for spin-singlet pairing, thereby providing a unified framework for understanding the electronic phase diagram of layered oxide superconductors. [13], based on real-space Ginzburg-Landau analysis, explores the inversion symmetry breaking and chirality induced by four-layer charge density waves in the Kagome superconductor CsV₃Sb₅, with conclusions that are relevant to similar possible CDW order in nickelates. [20] introduces hidden hyperuniform disorder into the Hubbard model, revealing the high sensitivity of electronic states and magnetic phase transitions in correlated systems to ordered microstructures, offering new insights into the regulation of disorder effects in nickelates. arXiv submission processing window: 2026-04-20 20:00 to 2026-04-21 18:14 UTC. ...

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], a review systematically summarizes experimental and theoretical progress on RP-phase nickel oxide superconductors, emphasizing that ultra-thin La₃Ni₂O₇ films grown on compressively strained substrates achieve ambient-pressure superconductivity, enabling experimental techniques such as angle-resolved photoemission spectroscopy. Theoretically, the Ni e_g and a_{1g} orbitals and the interlayer dimer picture are highlighted as key factors. In [3], density matrix renormalization group simulations of a three-leg t-J ladder with strong inter-chain coupling reveal that pair correlation functions exhibit power-law decay near 1/3 hole doping, forming asymmetric pairing compared to electron doping, providing numerical evidence for understanding the electronic properties of trilayer nickelate superconductors. These works collectively advance the understanding of the microscopic mechanism of nickel-based superconductivity. arXiv submission processing window: 2026-04-19 20:01 to 2026-04-20 19:34 UTC. ...

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. ...