Abstract
A high temperature (91.2 K) Y−Ba−Cu−O superconductor has been studied by monochromatized XPS core level measurements. The position, shape and satellite emission of Cu 2p indicate a mixture of Cu valencies 2+ and 1+ with some indication for the existence of a third oxidation state of 3+. The two component structure of the Ba 3d line suggests two principal Ba−O configurations due to oxygen vacancies. The shape and position of the Y 3d doublet imply only weak Y−O interactions.
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Werfel, F., Heinonen, M. & Suoninen, E. Oxidation states of Cu, Ba and Y in superconducting YBa2Cu3O7−x . Z. Physik B - Condensed Matter 70, 317–322 (1988). https://doi.org/10.1007/BF01317237
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DOI: https://doi.org/10.1007/BF01317237