Abstract

Ellipsometric measurements of the pseudodielectric function of YBa₂Cu₃O_7−x in the energy region 1.7–9.5 eV are presented. The variations in the optical spectra as a function of oxygen concentration and for substitution of different lanthanide ions for yttrium are discussed. New results obtained with CaBi₂ Sr₂Cu₂O₈ are shown and interpreted in terms of recent band-structure calculations.

© 1989 Optical Society of America

Use of x-ray absorption spectroscopy in electronic structure studies of high-Tc superconducting oxides

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