Hole Distribution in YBaCuO System from the Analysis of Cu 2<I>p</I>-XPS, Cu 2<I>p</I>-XAS and O 1<I>s</I>-XAS

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  • Seino Yasuhiro
    Department of Physics, Faculty of Science, Tohoku University
  • Okada Kozo
    Department of Physics, Faculty of Science, Tohoku University
  • Kotani Akio
    Department of Physics, Faculty of Science, Tohoku University

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  • Hole Distribution in YBaCuO System from the Analysis of Cu 2p-XPS,Cu 2p-XAS and O 1s-XAS
  • Hole Distribution in YBaCuO System from

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We analyze the polarization dependence of the Cu 2p-XAS and the Cu 2p-XPS observed in the YBa2Cu3O7−δ system. To take into account the nonequivalent Cu sites in YBa2Cu3O7, we use a model where the impurity Anderson model and a CuO4 cluster model are linked, where the former and the latter describe the CuO2 plane and the CuO chain, respectively, For YBa2Cu3O6.5, the CuO4 cluster is replaced by a CuO3 cluster. For 0<δ<0.5, the spectrum is obtained by a superposition of the spectra for δ=0 and 0.5. Obtained results quantitatively reproduce the experimental results of Cu 2p-XAS, and the electron configuration of the ground state obtained from our spectral analysis suggests that extra holes will enter both the O sites in the CuO chains and the CuO2 layers. This picture is also supported by the analysis of the polarization dependence in the O 1s-XAS.

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