Correlation effects and concomitant two-orbital s±-wave superconductivity in La3Ni2O7 under high pressure
Yi-Heng Tian, Yin Chen, Jia-Ming Wang, Rong-Qiang He, Zhong-Yi Lu
DOI 10.1103/PhysRevB.109.165154 · Physical Review B
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Abstract
High-Tc superconductivity (SC) has been found experimentally in the bilayer material La3Ni2O7 under high pressure recently, in which the Ni-3d3z2−r2 and 3dx2−y2 orbitals are expected to play a key role in the electronic structure and the SC. Here we study the two-orbital electron correlations and the nature of the SC in the framework of the dynamical mean-field theory using the bilayer two-orbital Hubbard model downfolded from the band structure of La3Ni2O7. We find that each of the two orbitals forms s±-wave SC pairing. Because of the interorbital hoppings, the two-orbital SCs are concomitant, and furthermore they transition to Mott insulating states simultaneously when tuning the system to half filling. The Hund's coupling induced local interorbital spin coupling enhances the electron correlations pronouncedly and is crucial to the 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. | — | Pressure not reported | unknown |
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