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VOLUME 47 (1988) | ISSUE 6 | PAGE 321
Optical study of YBa2Cu3O7-x, thin films by means of synchrotron radiation in the region 4-30 eV
The reflection, emission, and luminescence excitation spectra of a superconducting YBa2Cu307 _ x film have been studied with the help of synchrotron radiation for the first time. The results reveal a broad luminescence band of an exciton type at £"—2.8 eV. The intensity of this band has a structural feature at the temperature of the superconducting transition. This intensity decreases with a further increase in the temperature.