Pairing symmetry crossover from d-wave to s±-wave in a bilayer nickelate driven by Hund's coupling and crystal field splitting
Yicheng Xiong, Yanmei Cai, Tianxing Ma
DOI 10.1103/1sgg-ztw8 · Physical Review B
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Abstract
Using constrained-path quantum Monte Carlo simulations on a bilayer two-orbital Hubbard model, we systematically investigate the pairing symmetry competition in La3Ni2O7. Our findings reveal that Hund's coupling JH and crystal field splitting ΔE are the key factors controlling the ground-state pairing symmetry. Increasing either JH or ΔE robustly enhances the interlayer s±-wave pairing, driven by interlayer antiferromagnetic correlations, while simultaneously suppressing the intralayer d-wave pairing, which is mediated by intralayer antiferromagnetic spin fluctuations. In the physically relevant parameter regime for La3Ni2O7, the s±-wave emerges as the dominant pairing symmetry. Crucially, this robust s±-wave pairing persists even when the γ pocket is absent, providing theoretical support for the recent experimental observations of high-temperature superconductivity in thin films.
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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