s±-wave superconductivity in the bilayer two-orbital Hubbard model
Yao-Yuan Zheng, Wéi Wú
DOI 10.1103/PhysRevB.111.035108 · Physical Review B
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Abstract
Motivated by the recently discovered high-Tc nickelate superconductor La3Ni2O7, we investigate the S±-wave superconductivity (SC) in a two-dimensional Hubbard model on a square lattice that consists of two layers of hybridizing dx2−y2 and dz2 orbitals. Employing cluster dynamical mean-field theory, we establish phase diagrams resolving the crucial dependence of superconducting Tc on electron hybridization V between dx2−y2 and dz2 orbitals at the same layer and on hopping t⊥ between two dz2 orbitals at different layers. Here, V and t⊥ are presumably linked to the pairing phase coherence and the pairing glue of the system, respectively. Our result in general favors a two-component theory explanation of SC in a composite system. The influence of the pseudogap effect and Hund's coupling on SC are discussed as well as the implication of our result to the understanding of La3Ni2O7 SC.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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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