Abstract
The copper 2p12 and 2p32 x-ray photoelectron core level spectra (XPS) of the single phase high temperature (Tc=91K) superconductor YBa2Cu3O∼7 have been measured. Evidence for the strong localization of valence Cu 3d electrons is indicated by the Coulomb interaction Ucd∼9 eV between the 2p32 core hole and the localized 3d valence electron. A Coulomb interaction Udd of the order of 6 eV between 3d valence electrons has been estimated. No evidence of the 2p3d8 underline indicates the hole) final state due to the Cu3+ ions has been found. The broadening of atomic multiplets of the final state 2p3d9 going from CuO to YBa2Cu3O∼7 has been observed. These results are consistent with the formation of holes L in the oxygen derived band, i.e. of the 3d9L configuration, with additional oxygen x in YBa2Cu3O6.5+x, which should play a key role in the high-Tc superconductivity.
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