paper

Prediction of -wave superconductivity enhanced by electronic doping in trilayer nickelates LaNiO under pressure

arXiv:2402.05285 · doi:10.1103/PhysRevLett.133.136001

Abstract

Motivated by the recently reported signatures of superconductivity in trilayer LaNiO under pressure, we comprehensively study this system using {\it ab initio} and random-phase approximation techniques. Without electronic interactions, the Ni orbitals show a bonding-antibonding and nonbonding splitting behavior via the O orbitals inducing a ``trimer'' lattice in LaNiO, analogous to the dimers of LaNiO. The Fermi surface consists of three electron sheets with mixed orbitals, and a hole and an electron pocket made up of the orbital, suggesting a Ni two-orbital minimum model. In addition, we find that superconducting 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 }= point. With changing electronic density , the instability remains leading and its pairing strength shows a dome-like behavior with a maximum around ( electron doping). The superconducting instability disappears at the same electronic density as that in the new 1313 stacking LaNiO, correlated with the vanishing of the hole pocket that arises from the trilayer sublattice, suggesting that the high- superconductivity of LaNiO may originate from a trilayer- and single-layer structure. Furthermore, we predict an interesting spin-density-wave state in LaNiO with an in-plane (, ) order and antiferromagnetic coupling between the top and bottom Ni layers, while the middle layer has spin zero.

Main text with 6 pages and 4 figures plus SM with 4 pages and 5 figures

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