STUDY OF THE OCCUPIED AND UNOCCUPIED ELECTRONIC STATES OF THE Y-SUBSTITUTED (Bi,Pb)-2223 HIGH TEMPERATURE SUPERCONDUCTOR*)


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Abstract

Spectra for the filled and unfilled electronic states of the (Bi,Pb)-2223 high temperature superconductor were recorded by photoemission and fluorescence X-ray absorption in the entire doping range achieved by substitution of bivalent Ca ions with trivalent Y. In photoemission these samples show diminishing spectral intensity near EF and at 1.5 eV binding energy with increasing Y content. Parallel to the observations for the filled states the O1s X-ray absorption spectra show a decrease and a shift to higher energies of the empty states just above EF The spectral structures are identified in the framework of the Hubbard model.

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