ELECTRONIC-STRUCTURE CALCULATIONS FOR YBA2CU3O7 WITHIN THE SLAVE-BOSON FORMALISM

A novel method for self-consistent electronic structure calculations f or correlated metals is presented. This approach takes into account on -site Coulomb repulsion among localized electrons and is based on the slave boson formalism. The proposed method was applied to the study of the electronic structure of YBa2Cu3O7: the on-site Coulomb repulsion of Cu 3d electrons gives origin to a flat band at the Fermi level, as observed in experiments. A sharp Van Hove singularity has been found 2 5 meV below the Fermi energy.