Abstract
Normal-state properties of the two-dimensional model proposed by Emery for copper-oxide superconductors are studied within the Gutzwiller approximation. For larger intrasite repulsion it is found that hybridization produces quasihole bands with a reduced kinetic energy. For hole densities between 1 and 2, the reduction factor q is proportional to (epsilon/sub 0//sup -1/+(u-epsilon/sub 0/)/sup -1/)/sup 2/ where epsilon/sub 0/ = deltaepsilon/t, u = U/t, deltaepsilon is the difference in energy between the copper and the oxygen levels, and t is the hybridization energy. These results differ qualitatively from those for the heavy-fermion case where q is exponentially small, resulting in small Fermi energy (large effective mass). In the present case holes are only moderately heavy so that the Fermi energy is large.
Published Version
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