Abstract
Covalent nature of the Cu(dx2−y2)-O(px,y) bonding and strong correlation at Cu sites are used to contruct a model describing the normal Fermi liquid state of high-Tc copper-oxide superconductors: the Hubbard model is extended in such a way that electrons can migrate both onto Cu and O sites but the correlation works only at Cu sites. It is shown that the physics of such a model is essentially the same as that of heavy fermions but in a different energy scale: the valence of Cu is approximately fixed as Cu2+, the effective bandwidth T0∼103K, and the antiferromagnetic spin fluctuation mechanism dominates over the charge fluctuation (phonon or exciton) one.
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