A PHOTOEMISSION-STUDY OF THE YBA2CU3O7-AU COMPOSITE

Characterization of the YBa2Cu3O7-Au composite at room temperature has been performed using X-ray photoelectron spectroscopy. Measured spect ra on the chemically etched surfaces have been found to be representat ive of the bulk material. Ana lysis of the core-level spectra of coppe r indicated the contribution of the Cu-(3+) valence state in the sampl es. The core-level spectra of gold showed the Au valence state to be b etween 1+ and 2+. The incorporated gold atoms had no influence on the level positions of the other constituents of the material.