Oxidation states of Cu,Ba and Y in superconducting YBa2Cu3O7−x |
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| Authors: | F. Werfel M. Heinonen E. Suoninen |
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| Affiliation: | (1) Department of Physical Sciences, University of Turku, SF-20500 Turku, Finland;(2) Present address: Sektion Physik der Martin-Luther-Universität Halle, Friedemann-Bach-Platz 6, DDR-4020 Halle, GDR |
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| 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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