Abstract
An extended multiband Hubbard model of the two-dimensional CuO2 planes of high-Tc 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.
Original language | English |
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Pages (from-to) | 2924-2927 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 39 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Feb 1989 |