Optical study of YBa2Cu3O7-x, thin films by means of synchrotron radiation in the region 4-30 eV
Stankevich V. G., Svechnikov N. Yu., Kaznacheev K. V., Kink R. A., Niedrais Kh. E., Golubev V. N., Kosyev V. Ya., Simirskii Yu. N., Tsetlin M. B.
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.