dx2−y2 superconductivity in a generalized Hubbard model
Liliana Arrachea, A. A. Aligia
DOI 10.1103/PhysRevB.59.1333 · Physical Review B
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Abstract
We consider an extended Hubbard model with nearest-neighbor correlated hopping and next-nearest-neighbor hopping t′ obtained as an effective model for cuprate superconductors. Using a generalized Hartree-Fock BCS approximation, we find that for high enough t′ and doping, antiferromagnetism is destroyed and the system exhibits d-wave superconductivity. Near optimal doping we consider the effect of antiferromagnetic spin fluctuations on the normal self-energy using a phenomenological susceptibility. The resulting superconducting critical temperature as a function of doping is in good agreement with experiment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4 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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