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

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.4277· OSTI ID:6203227

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

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-T/sub c/ s-wave superconductivity develops in a variety of situations. The validity of this model for the high-T/sub c/ Cu-O superconductors is discussed.

• Research Organization: Centro de Fiiaasica, Instituto Venezolano de Investigaciones Cientiiaaficas, Apartado Postal 21827, 1020A Caracas, Venezuela
• OSTI ID: 6203227
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL MODELS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HAMILTONIANS
HOLES
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PAIRING INTERACTIONS
PRODUCTION MECHANISMS
QUANTUM OPERATORS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS