Electronic structure changes and superconductivity in YBa2Cu3O7-x

D. H. Kim, D. D. Berkley, A. M. Goldman, R. K. Schulze, M. L. Mecartney

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X-ray photoelectron spectroscopy (XPS) studies were performed on bulk polycrystalline samples of YBa2Cu3O7-x as a function of temperature through the superconducting transition. With decreasing temperature, clear changes were observed in the photoelectron spectrum which can be interpreted as signatures of the Cu3+ and perhaps the Cu1+ oxidation states, in addition to the usual Cu2+ state. These changes were not observed in samples which had been rendered nonsuperconducting by baking in vacuum. These results may have implications for the mechanism for superconductivity in this high-Tc compound.

Original languageEnglish (US)
Pages (from-to)9745-9748
Number of pages4
JournalPhysical Review B
Issue number16
StatePublished - 1988
Externally publishedYes


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