Resonance Raman scattering as a probe of oxygen dynamics in YBa2Cu3Ox

Kall, M Osada, M Backstrom, J Kakihana, M Borjesson, L Frello, T Madsen, J Andersen, NH Liang, R Dosanjh, P Hardy, WN International Conference on Spectroscopies in Novel Superconductors (SNS’97) SEP 14-18, 1997 CAPE COD, MASSACHUSETTS
We report on the metastable photo-bleaching of the 2.15 eV yellow Raman resonance in oxygen deficient YBa2Cu3Ox (x = 6.35-6.87), extending investigations by Wake ct al. (Phys. Rev. Lett., 1991,67, 3728) for x approximate to 7. Polarization, x dependence and phonon spectra indicate that the resonance is localized at oxygen vacancies in long CuO-chains. The resonance is thermally reactivated from the metastable bleached state with a relaxation time tau similar to exp[Delta/k(B)T] with Delta approximate to 1 eV. The resulting temperature dependent equilibrium resonance intensity essentially miners the oxygen superstructure disordering around T* approximate to 100 degrees C observed in the same crystals by hard X-ray diffraction, thus offering a new effective probe of chain-oxygen dynamics in YBa2Cu3Ox. (C) 1998 Elsevier Science Ltd. All rights reserved.

Ingår i:Journal of Physics and Chemistry of Solids59, s. 1988-19900022-36971879-2553

Av författaren/redakt...: Kall, M.; Osada, M.; Bäckström, Joaki ...; Kakihana, M.; Borjesson, L.; Frello, T.; visa fler...; Madsen, J.; Andersen, N. H.; Liang, R.; Dosanjh, P.; Hardy, W. N.; visa färre...

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