Oxygen stoichiometry and the electronic structure of high-temperature superconductors

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


Year:
1988
Keywords:
Note:
Wisconsin Univ., Madison, WI, USA
3130066
high temperature superconductivity
O stoichiometry dependence
electronic structure
transport properties
superconducting behavior
thermal annealing
synchrotron radiation
line-shape
upper valence band features
relative intensity
Cu satellite features
Ba2YCu3O7+x
EuBa2Cu3O7+x
Laboratories:




 Record created 2006-10-03, last modified 2018-03-18


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