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.
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Titolo: | Exact 2-particle Effective Interaction and Superconductivity In the 2-level Hubbard-model | |
Autori: | ||
Data di pubblicazione: | 1989 | |
Rivista: | ||
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. | |
Handle: | http://hdl.handle.net/11581/241989 | |
Appare nelle tipologie: | Articolo |