Effective model and -wave superconductivity in trilayer nickelate LaNiO
arXiv:2402.05447 · doi:10.1103/PhysRevB.109.L220506
Abstract
The recent discovery of bulk superconductivity in trilayer nickelate LaNiO with the critical temperature near K under high pressure is attracting a new wave of research interest, after the breakthrough of bilayer LaNiO with near K. The similarities and differences of electronic structure and superconducting mechanism in these two systems are urgent theoretical issues. In this Letter, we study the electronic band structure and construct a minimal trilayer tight-binding model for the high-pressure phase of LaNiO in terms of the nickel and orbitals, and study the superconducting mechanism due to local Coulomb interactions by the unbiased functional renormalization group. We find antiferromagnetic correlations between the outer layers instead of neighboring ones, apart from the inplane correlations. The effective interaction induces Cooper pairing with the -wave symmetry, which changes sign across the Fermi pockets. We find in LaNiO is systematically lower than that in LaNiO, and electron doping can enhance .
4 pages, 4 figures, 1 table
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Cited by in corpus (42)
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