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Evidence for incipient O dimerization and absence of Cu+3 in temperature-dependent XPS of highT c superconducting oxides

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Zeitschrift für Physik B Condensed Matter

Abstract

From temperature-dependent X-ray photoemission (XPS) spectra between 300 and 10 K of Sr doped La2CuO4 and “123” compounds (YBa2Cu3O7−δ) we deduce the absence of the Cu3d 8(Cu3+) configuration in the ground state of these Mott insulators. The metallic character of these samples and involving those Cu atoms which are relevant for the superconducting properties arises from α(d 9 p 6)+β(d 10 p 5) valence fluctuations, while the superconducting transition is indicated to be closely related to an incipient oxygen dimerization which is best detected upon cooling far belowT c .

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Authors and Affiliations

  1. Institut für Festkörperforschung, Kernforschungsanlage Jülich GmbH, Postfach 1913, D-5170, Jülich 1, Germany

    T. Kachel, P. Sen & B. Dauth

  2. ASEA-BBC Corporate Research Center, CH-5405, Baden-Dättwil, Switzerland

    M. Campagna

Authors
  1. T. Kachel
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  2. P. Sen
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  3. B. Dauth
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  4. M. Campagna
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Kachel, T., Sen, P., Dauth, B. et al. Evidence for incipient O dimerization and absence of Cu+3 in temperature-dependent XPS of highT c superconducting oxides. Z. Physik B - Condensed Matter 70, 137–139 (1988). https://doi.org/10.1007/BF01318290

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  • DOI: https://doi.org/10.1007/BF01318290

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