Resonant Raman scattering and photoinduced metastability in oxygen-deficient YBa2Cu3Ox

Osada, M Kakihana, M Backstrom, J Kall, M Borjesson, L International Discussion Meeting on Chemistry Approaches to High-T(c) Superconductive Materials/5th International Workshop on Chemical Designing and Process on High-T(C) Superconductors OCT 15-16, 1999 NAGATSUTA, JAPAN
We studied the photoinduced metastable states in oxygen-deficient YBa2Cu3Ox (Y123) (x = 6.35-6.87). The states are identified by the intensity dependences of CuO-chain resonance on photo irradiation and temperature. Below room temperature (RT) the CuO-chain resonance can be completely suppressed by irradiation with visible light polarized along the CuO chains, indicating photo-assisted oxygen ordering. Above RT, the resonance intensity returns and saturates at T > 100 degrees C. This behavior exactly reflects the temperature dependence of chain oxygen ordering in the same crystals observed by hard X-ray diffraction. The stability of the photo-induced state is in agreement with reported persistent photo-induced superconductivity effects. (C) 2000 Elsevier Science B.V. All rights reserved.

By the author/editor: Osada, M.; Kakihana, M.; Bäckström, Joaki ...; Kall, M.; Borjesson, L.

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