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Daily Overview: Today’s highlight focuses on deepening the understanding of the electronic structure of mixed Ruddlesden-Popper nickelates. In [1], the researchers combined high-resolution angle-resolved photoemission spectroscopy with a tight-binding model to systematically reveal the electronic structure of the trilayer nickel oxide La₄Ni₃O₁₀. For the first time, band splitting induced by interlayer coupling was experimentally observed, and a momentum-dependent density wave gap structure on the Fermi surface was resolved. Its origin can be attributed to interlayer antiferromagnetic spin density waves resulting from mirror-symmetry-selective Fermi surface nesting. This work also confirms the dominant role of the Ni-3d_z² orbital in low-energy physics, providing a key framework for understanding the formation mechanism of density wave order under ambient pressure and the correlation between pressure-induced superconductivity and interlayer spin fluctuations. arXiv submission processing window: 2026-01-30 06:01 to 2026-01-30 06:01 UTC. ...

arXiv Daily: nickelate superconductors 2026-01-30

Daily Overview: Dear readers, welcome to today’s quick overview of papers in the field of nickel-based superconductivity. The highlights of today focus on the complex interplay between superconductivity and magnetism in infinite-layer nickelate systems, as well as studies on bosonic phase transitions. In [1], the researchers observed magnetic-field-induced superconducting reentrance in Eu-doped infinite-layer nickelates, revealing the critical role of the competing magnetic responses between Eu²⁺ and Nd³⁺ rare-earth ions in regulating the superconducting state, thereby providing new perspectives on unconventional pairing mechanisms. In [2], by nano-patterning to modulate the Cooper pair phase coherence in infinite-layer samarium nickelates, h/2e magnetoresistance oscillations were directly observed experimentally, confirming the existence of 2e Cooper pairing. Additionally, two anomalous metallic phases were identified, establishing nickelates as an important platform for studying bosonic phase transitions. arXiv submission processing window: 2026-01-27 11:01 to 2026-01-27 11:34 UTC. ...

arXiv Daily: nickelate superconductors 2026-01-27

Daily Overview: Today’s highlight focuses on deepening the understanding of the electronic structure in hybrid Ruddlesden-Popper nickelates. In [1], a study based on ¹³⁹La nuclear quadrupole resonance (NQR) reveals the intricate intertwining of charge density wave (CDW) and spin density wave (SDW) in the trilayer nickel oxide La₄Ni₃O₁₀. The experiment finds that the density wave transition is first-order in nature and exhibits an incommensurate order. Strong spin fluctuations above the transition temperature indicate a coupling mechanism between CDW and SDW. This work provides key experimental evidence for understanding the microscopic origin of density wave states and their relationship with the superconducting phase in nickel-based superconductors. arXiv submission processing window: 2026-01-25 02:46 to 2026-01-25 02:46 UTC. ...

arXiv Daily: nickelate superconductors 2026-01-25

Daily Overview: This post sorts papers by relevance to nickelate superconductors. Summaries are AI-generated and may contain errors. arXiv submission processing window: times are unavailable (UTC). 1. Structural stability, electronic structure, and magnetic properties of the single-layer trilayer La3Ni2O7 polymorph Relevance Score: 5.9469 Authors: Shekhar Sharma, Yi-Feng Zhao, Antia S. Botana Link: http://arxiv.org/abs/2601.15858v1 Summary: This study systematically investigates the structural stability, electronic structure, and magnetic properties of the alternating monolayer-trilayer (1313) stacked La₃Ni₂O₇ polymorphs using first-principles calculations and group theory analysis. At ambient pressure, the highest-symmetry Cmmm structure exhibits multiple unstable phonon branches at high-symmetry points in the Brillouin zone, and the corresponding distortions can lead to another experimentally reported space group Imma, which features NiO₆ octahedral tilting. Magnetic analysis indicates that the electronic structure of this material at ambient pressure is predominantly governed by the trilayer block, whereas the monolayer block is in a Mott insulating state. Under pressure, the tetragonal P4/mmm structure becomes stable, consistent with experimental observations. The study reveals that octahedral tilting is not a prerequisite for superconductivity and elucidates the symmetry relationships among different space groups as well as the pressure-driven structural phase transition mechanism. ...

arXiv Daily: nickelate superconductors 2026-01-22

Daily Overview: This post sorts papers by relevance to nickelate superconductors. Summaries are AI-generated and may contain errors. arXiv submission processing window: times are unavailable (UTC). 1. Spin Fluctuations in the Rare-Earth Doped Bilayer Nickelates Relevance Score: 5.5834 Authors: Honglin Zhou, Xinman Ye, Gang Wang, Devashibhai Adroja, David Tam, Michael Marek Koza, Zhilun Lu, Jinguang Cheng, Dao-Xin Yao, Huiqian Luo Link: http://arxiv.org/abs/2601.14946v2 Summary: The spin fluctuations in rare-earth Pr and Nd doped bilayer nickelates La₂LnNi₂O₇₋δ (Ln = La, Pr, Nd) were investigated under ambient pressure using inelastic neutron scattering. In the undoped La₃Ni₂O₇₋δ, a flat spin fluctuation mode at 45 meV was observed; upon doping, this mode splits into two modes at 43 and 48 meV, with an additional weak mode appearing at approximately 60 meV. Notably, the spin fluctuation intensity in La₂NdNi₂O₇₋δ is significantly higher than that in La₃Ni₂O₇₋δ and La₂PrNi₂O₇₋δ. These results are consistent with a description based on the stripe-type antiferromagnetic Heisenberg model, indicating that rare-earth doping enhances the interlayer magnetic coupling, with the interlayer exchange coupling SJ⊥ increasing from about 60 meV to 69–73 meV, while the intralayer coupling remains weak (≤3.5 meV). This enhancement may account for the increase in superconducting transition temperature from 80 K to near 100 K following rare-earth doping. This work reveals the regulatory role of rare-earth doping on spin dynamics and superconducting pairing in bilayer nickelates. ...

arXiv Daily: nickelate superconductors 2026-01-21