Paper

Daily Overview: Today’s highlights focus on the in-depth understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], Zhou et al. achieved a superconducting onset temperature of approximately 63 K in (La,Pr)₃Ni₂O₂ thin films under ambient pressure via giant oxidative atomic layer epitaxy, and found that the superconducting enhancement is closely associated with strange metal behavior (α≈1), with significantly stronger interlayer coupling than that of bismuth-based cuprates. In [2], Wang et al.’s high-field transport study of La₂.₈₂Sr₀.₁₈Ni₂O₇ thin films revealed that the in-plane upper critical field is strongly suppressed by the Pauli paramagnetic limit (approximately 58 T), with an anisotropy ratio γ≈1.34, supporting a three-dimensional bulk superconductivity in this system and highlighting the critical role of spin paramagnetic effects in determining the high-field phase diagram. In [3], Sanchez-Manzano et al. characterized the superconducting dimensionality of infinite-layer Pr₀.₈Sr₀.₂NiO₂ thin films through vortex phase diagrams, discovering a quasi-two-dimensional vortex liquid-to-glass transition at low disorder, while enhanced disorder drives the system into a purely two-dimensional state, establishing disorder strength as a key tuning parameter. These three works collectively reveal the intrinsic relationships among dimensionality, interlayer coupling, and anomalous normal-state behavior in nickel-based superconductivity from the perspectives of superconducting enhancement mechanisms, paramagnetic pair-breaking limits, and vortex dimensionality tuning. arXiv submission processing window: 2026-03-12 00:00 to 2026-03-12 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-03-12

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of hybrid Ruddlesden–Popper nickelates. Two systematic muon spin rotation and resistivity studies, investigating the density wave orders in trilayer La₄Ni₃O₁₀ and bilayer La₃Ni₂O₇ respectively, employ pressure tuning and oxygen isotope substitution to reveal the intrinsic intertwining nature of spin density waves and charge density waves, as well as their distinct microscopic origins—the former primarily arising from electronic correlations, while the latter is significantly driven by electron–phonon coupling. The findings further suggest that suppressing the CDW order may be the key to achieving high-pressure superconductivity. These conclusions provide important constraints for understanding the pairing mechanism of high-pressure superconductivity in Ruddlesden–Popper nickelates. Additionally, a theoretical framework article starts from the ionically bonded O-/M bridging carrier pairing, unifying the pairing picture above room temperature in both cuprates and nickelates, and lists 32 pieces of experimental evidence to support its universality. Another study based on ARPES spectral scaling reveals that various strongly correlated materials, including La₃Ni₂O₇, exhibit universal spectral collapse in the marginal dynamics regime, indicating a universal dynamical origin for incoherent electronic states. Although these two works do not entirely focus on nickelates, they provide cross-support for the microscopic picture of their superconducting pairing mechanism and the unified understanding of their spectral features, respectively. arXiv submission processing window: 2026-03-11 00:00 to 2026-03-11 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-03-11

Daily Overview: Today’s highlights focus on deepening the understanding of the electronic structure of hybrid Ruddlesden-Popper nickelates. In [1], effective regulation of hole carriers was achieved through Na doping of La₃Ni₂O₇₊δ, significantly enhancing metallicity and suppressing the density wave transition, providing key experimental evidence for understanding the role of element substitution in stabilizing the high-pressure superconducting phase. Using soft X-ray absorption spectroscopy combined with theoretical calculations, [2] systematically tracked the topological reduction process from perovskite to infinite-layer nickelates, revealing that even in the most reduced films, the Ni 3d hole count remains as high as 1.35, and O 2p holes persist throughout. This challenges the simple hole-injection model of superconductivity, highlighting a complex synergistic mechanism involving self-doping and oxygen non-stoichiometry. Additionally, [3] rigorously examined the common method of estimating superconducting volume fractions based on internal magnetic susceptibility, pointing out that non-uniform distribution of the demagnetization factor can lead to significant overestimation, offering an important methodological caution for determining bulk superconductivity in systems such as Pr₄Ni₃O₁₀. arXiv submission processing window: 2026-03-10 00:00 to 2026-03-10 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-03-10

Daily Overview: — Greetings, dear readers, and welcome to today’s rapid overview of research in the field of nickel-based superconductors. Today’s highlights focus on the electronic structure and superconducting mechanisms of mixed Ruddlesden-Popper nickelates and infinite-layer nickelates. In [1], through fluctuation exchange approximation analysis, it is found that hole doping in La₃Ni₂O₇ thin films can enhance the Fermi surface nesting-driven s±-wave pairing, providing a theoretical pathway for raising the superconducting transition temperature. In [2], systematic measurements of the superfluid density in Nd₁₋ₓSrₓNiO₂ thin films reveal the critical role of phase fluctuations in limiting the critical temperature, and uncover a strong coupling between the Nd 4f magnetic moments and the superfluid, with two-dimensional BKT behavior dominating the superconducting transition. These findings deepen our understanding of the pairing mechanisms and superfluid response in these two types of nickel-based superconductors. arXiv submission processing window: 2026-03-09 00:00 to 2026-03-09 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-03-09

Daily Overview: Today’s highlights focus on the optimization of Ruddlesden-Popper nickelate thin film preparation and the discovery of unconventional superconductivity. In [1], the research team successfully fabricated phase-pure, high-quality Ln₃Ni₂O₇ thin films using giant oxidative atomic layer epitaxy, and systematically revealed the decisive role of four key factors—cation stoichiometry, atomic layer coverage, oxygen content, and interface reconstruction—on superconducting performance. The optimized films exhibited an onset transition temperature of up to 50 K, providing important guidance for the epitaxial growth of high-quality nickel-based superconducting thin films. In [2], through electrical transport measurements of (La, Pr, Sm)₃Ni₂O₇ bilayer nickelate thin films, time-reversal symmetry breaking superconductivity accompanied by electronic glass behavior was discovered for the first time, including features such as anomalous magnetoresistance hysteresis, nonreciprocal current-voltage response, and logarithmic slow relaxation. This finding offers groundbreaking phenomenological evidence and a conceptual framework for understanding the mechanism of nickel-based high-temperature superconductivity. arXiv submission processing window: 2026-03-05 00:00 to 2026-03-05 00:00 UTC. ...

arXiv Daily: nickelate superconductors 2026-03-05