Abstract
A Ud= infinity extended Hubbard Hamiltonian (EHH) with a qualitatively accurate band structure, appropriate for a cubic lattice is investigated. At half filling the system undergoes a metal-insulator transition at a critical value of the charge transfer gap. Doping beyond half filling produces rapid metallisation of the insulating state. For all dopings considered, the effective quasiparticle-quasiparticle interaction is only attractive in the d channel with sinkxsinky symmetry. The effective interaction in all symmetry channels is suppressed on doping.
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