Variational quantum Monte Carlo investigations of the superconducting pairing in La3Ni2O7
Yi-Qun Liu, Da Wang, Qiang-Hua Wang
DOI 10.1103/c8cd-17tv · Physical Review B
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Abstract
We investigate the pairing symmetry in the novel superconductor La3Ni2O7 under pressure by the nonperturbative variational quantum Monte Carlo. Within the bilayer Hubbard model and extended t−J model with two orbitals in the Eg doublet, we find the local strong correlation triggers s±-wave Cooper pairing, with sign change of the gap function among the various Fermi pockets, while the dx2−y2-wave pairing is generically disfavored. This is in agreement with the results from functional renormalization group applied in the weak up to moderate correlation limit. We find the 3d3z2−r2 orbital plays a leading role in the superconducting pairing. We also demonstrate the finite intraorbital double occupancy even in the strong correlation limit, shedding light on the itinerant versus local moment picture of the electrons in this material.
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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