PAIRING IN Cu-O SYSTEMS: RENORMALIZATION GROUP AND EXACT DIAGONALIZATION RESULTS

Abstract
We model the Cu-O high T c compounds by a generalized Hubbard Hamiltonian that includes an intersite Coulomb repulsion G. We use a real space renormalization group approach to calculate effective interactions and gap energies in infinite chains. The results indicate attraction between added holes in these systems. The magnitudes of these attractive energies are compared with exact results obtained by the Lanczos method for finite clusters.

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