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Oxygen stoichiometry and the electronic structure of high-temperature superconductors

  • Chang, Y.
  • Ming, Tang
  • Onellion, M.
  • Hampshire, D.
  • Larbalestier, D. C.
  • Margaritondo, G.
  • Stoffel, N. G.
  • Tarascon, J. M.
Publication Date
Jan 01, 1988
Infoscience @ EPFL
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The oxygen content determines the transport properties of Ba<sub>2</sub>YCu<sub>3</sub>O<sub>7+x</sub> and EuBa<sub>2</sub>Cu<sub>3</sub>O<sub>7+x</sub>, and in particular their superconducting behavior at high temperatures. The authors studied the changes in the Ba<sub>2</sub>YCu<sub>3</sub>O<sub>7+x</sub> electronic structure which are caused by modifications in the amount of oxygen. The modifications were achieved either by thermal annealing or by exposure to `white' synchrotron radiation which causes oxygen desorption, with similar results. They found that the decrease in oxygen content affects the line-shape of the upper valence band features and the relative intensity of the Cu satellite features. The lineshape changes simplify the identification of oxygen-related features in the upper valence band region. The exposure to `white' synchrotron radiation of Ba<sub>2</sub>EuCu<sub>3</sub>O<sub>7+x</sub> did not produce similarly large spectral changes

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