paper

Structural phase transition, -wave pairing and magnetic stripe order in the bilayered nickelate superconductor LaNiO under pressure

arXiv:2307.15276 · doi:10.1038/s41467-024-46622-z

Abstract

Motivated by the recently discovered high- superconductor LaNiO, we comprehensively study this system using density functional theory and random phase approximation calculations. At low pressures, the Amam phase is stable, containing the Y mode distortion from the Fmmm phase, while the Fmmm phase is unstable. Because of small differences in enthalpy and a considerable Y mode amplitude, the two phases may coexist in the range between 10.6 and 14 GPa, beyond which the Fmmm phase dominates. In addition, the magnetic stripe-type spin order with wavevector (, 0) was stable at the intermediate region. Pairing is induced in the -wave channel due to partial nesting between the {\bf M}= centered pockets and portions of the Fermi surface centered at the {\bf X}= and {\bf Y}= points. This resembles results for iron-based superconductors but has a fundamental difference with iron pnictides and selenides. Moreover, our present efforts also suggest that LaNiO is qualitatively different from infinite-layer nickelates and cuprate superconductors.

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