Photoinduced changes in Raman spectra of the superconducting ceramic YBa2Cu3O7–<i>δ</i>
V. P. GnezdilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. V. EremenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. I. FominPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
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The effect of photoexcited charge carriers on the two-magnon scattering spectrum of light in the ceramic YBa2Cu3O7–δ is studied. The intensity of two-magnon scattering bands is found to decrease under the action of laser radiation. Photoexcited variations in the Raman spectra are found to be long-lived, and the sample relaxes to the original state at room temperature only after about 40 h. Possible mechanisms responsible for the observed effect are discussed.
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