Exact two-particle effective interaction and superconductivity in the two-level Hubbard model

R. Medina; U. Marini Bettolo Marconi; S. J. Sciutto

doi:10.1103/PhysRevB.39.4277

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Exact two-particle effective interaction and superconductivity in the two-level Hubbard model

R. Medina, U. Marini Bettolo Marconi, S. J. Sciutto

DOI 10.1103/PhysRevB.39.4277 · Physical Review B

T1

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Abstract

A two-dimensional two-level Hubbard model with on-site repulsions only, is studied. By solving the two-particle problem, the effective interaction in the lower band is calculated exactly in the empty band limit. This interaction is found to consist of two terms: an on-site repulsion and a nearest-neighbor resonant superexchange. Within the Hartree-Fock approximation it is found that high-Tc s-wave superconductivity develops in a variety of situations. The validity of this model for the high-Tc Cu-O superconductors is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La-(Ba,Sr)-Cu-O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown