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VOLUME 54 (1991) | ISSUE 4 | PAGE 241
Photostimulated changes in Raman scattering of YBa2Cu3O7-δ
Photostimulated changes in the spectra of two-magnon scattering of light by YBa2 Cu3 0Ί_δ films have been studied. The intensity of the two-magnon scattering band is reduced by an Ar + laser beam. The changes observed in the Raman spectra are long-lived: It takes 2 days for the samples to relax to their original state, before the illumination, at room temperature.