Attractive interactions from repulsive forces in a multiband Hubbard model

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

DOI:https://doi.org/10.1103/PhysRevB.39.2924· OSTI ID:6481388

Stephan, W H; Linden, W v.d.; Horsch, P

An extended multiband Hubbard model of the two-dimensional CuO/sub 2/ planes of high-T/sub c/ superconductors is examined by exact diagonalization of the Hamiltonian for small clusters with periodic boundary conditions. Holes are shown to bind in the limit of large Cu-site and nearest-neighbor Cu-O Coulomb repulsion. A simple explanation of the source of the binding energy is given in this strong-coupling limit. The more realistic case of relatively weak nearest-neighbor repulsion is also examined, and suggestive evidence is presented that the effective attraction will also exist in the thermodynamic limit for this case.

• Research Organization: Max-Planck-Institut fuer Festkoerperforschung, D-7000 Stuttgart 80, Federal Republic of Germany
• OSTI ID: 6481388
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
BINDING ENERGY
BOUNDARY CONDITIONS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
ELECTRON CORRELATION
ENERGY
HAMILTONIANS
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
QUANTUM OPERATORS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS