Effective model and s±-wave superconductivity in trilayer nickelate La4Ni3O10
Qing-Geng Yang, Kai-Yue Jiang, Da Wang, Hong-Yan Lu, Qiang-Hua Wang
DOI 10.1103/PhysRevB.109.L220506 · Physical Review B
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Abstract
The recent discovery of bulk superconductivity in trilayer nickelate La4Ni3O10 under high pressure is attracting a new wave of research interest. In this Letter, we study its electronic band structure and construct a minimal trilayer tight-binding model in terms of the nickel 3dx2−y2 and 3d3z2−r2 orbitals, and investigate 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 in-plane correlations. The effective interaction induces Cooper pairing with the s±-wave symmetry, which changes sign across the Fermi pockets. In addition, we find the Tc in La4Ni3O10 is systematically lower than that in La3Ni2O7, but electron doping can further enhance Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La4Ni3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 43 GPa | zero_resistance |
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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