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Oxygen stoichiometry and the electronic structure of high-temperature superconductors

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Infoscience @ EPFL
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Abstract

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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