Microscopic Origin of Pressure-Enhanced and Robust Superconductivity in Infinite-Layer La0.8Sr0.2NiO2
Abstract
Recent transport measurements on freestanding La0.8Sr0.2NiO2 membranes revealed a broad superconducting dome extending from ambient pressure to 210 GPa, with an onset transition temperature reaching 74.5 K near 146 GPa. Using first-principles calculations, a pressure-dependent two-orbital model, and self-consistent FLEX calculations combined with the linearized Eliashberg equation, we determine how compression modifies the pairing tendency. Pressure increases the kinetic-energy scale, reduces Ux/t1, strengthens interlayer hybridization, and transfers holes from the La/Sr-derived charge reservoir to the correlated Ni sector. Within the present low-energy description, the increasing kinetic scale and the approach to optimal intermediate coupling account for the initial enhancement of pairing, whereas pressure-induced self-doping into the overdoped regime is primarily responsible for its high-pressure suppression. Despite a pronounced three-dimensionalization of the Fermi surface, the pairing-relevant spin susceptibility remains weakly dependent on qz and peaked near (π,π). Consequently, the Ni-dx2−y2-dominated d-wave pairing state remains stable over the calculated pressure range. These results provide a unified microscopic interpretation of both the superconducting dome and its unusual robustness under megabar compression.
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BibTeX
@misc{zhang2026microscopic,
title = {{Microscopic Origin of Pressure-Enhanced and Robust Superconductivity in Infinite-Layer La$_0.8$Sr$_0.2$NiO$_2$}},
author = {Jian-Feng Zhang and Zhong-Yi Lu and Tao Xiang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00586},
eprint = {2609.00586},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00586},
}
RIS
TY - UNPB
TI - Microscopic Origin of Pressure-Enhanced and Robust Superconductivity in Infinite-Layer La_0.8Sr_0.2NiO_2
AU - Jian-Feng Zhang
AU - Zhong-Yi Lu
AU - Tao Xiang
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.00586
UR - https://arxiv.org/abs/2609.00586
AB - Recent transport measurements on freestanding La_0.8Sr_0.2NiO_2 membranes revealed a broad superconducting dome extending from ambient pressure to 210 GPa, with an onset transition temperature reaching 74.5 K near 146 GPa. Using first-principles calculations, a pressure-dependent two-orbital model, and self-consistent FLEX calculations combined with the linearized Eliashberg equation, we determine how compression modifies the pairing tendency. Pressure increases the kinetic-energy scale, reduces U_x/t_1, strengthens interlayer hybridization, and transfers holes from the La/Sr-derived charge reservoir to the correlated Ni sector. Within the present low-energy description, the increasing kinetic scale and the approach to optimal intermediate coupling account for the initial enhancement of pairing, whereas pressure-induced self-doping into the overdoped regime is primarily responsible for its high-pressure suppression. Despite a pronounced three-dimensionalization of the Fermi surface, the pairing-relevant spin susceptibility remains weakly dependent on q_z and peaked near (π,π). Consequently, the Ni-d_x^2−y^2-dominated d-wave pairing state remains stable over the calculated pressure range. These results provide a unified microscopic interpretation of both the superconducting dome and its unusual robustness under megabar compression.
ER -