The -Wave Superconductivity in the Pressurized LaNiO
arXiv:2402.07902 · doi:10.1103/PhysRevB.110.L180501
Abstract
Recently, evidence of superconductivity (SC) has been reported in pressurized LaNiO. Here we study the possible pairing mechanism and pairing symmetry in this material. Through fitting the density-functional-theory band structure, we provide a six-orbital tight-binding model. In comparison with the band structure of LaNiO, the additional non-bonding band is importance to the pairing mechanism here. When the multi-orbital Hubbard interactions are included, our random-phase-approximation based study yields an -wave pairing. The dominant FS nesting with nesting vector is between the -pocket contributed by the bonding band top and the -pocket contributed by the non-bonding band bottom, leading to the strongest pairing gap amplitude and opposite gap signs within the two regimes. The dominant real-space pairing is the interlayer pairing between the orbitals. We have also studied the doping dependence of the pairing symmetry and .
5 pages, 5 figures
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