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.
Exact 2-particle Effective Interaction and Superconductivity In the 2-level Hubbard-model
MARINI BETTOLO MARCONI, Umberto;
1989-01-01
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.File in questo prodotto:
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