Attractive interactions from repulsive forces in a multiband Hubbard model

Journal Article · Wed Feb 01 00:00:00 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), Vol. 39:4
• Country of Publication: United States
• Language: English

Related Subjects

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