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Resonance Raman scattering as a probe of oxygen dynamics in YBa2Cu3Ox
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1998 (Engelska)Ingår i: Journal of Physics and Chemistry of Solids, ISSN 0022-3697, E-ISSN 1879-2553, Vol. 59, s. 1988-1990Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
1998. Vol. 59, s. 1988-1990
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Identifikatorer
URN: urn:nbn:se:miun:diva-14347OAI: oai:DiVA.org:miun-14347DiVA, id: diva2:435994
Anmärkning
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, MASSACHUSETTSTillgänglig från: 2011-08-22 Skapad: 2011-08-19 Senast uppdaterad: 2017-12-08Bibliografiskt granskad

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Bäckström, Joakim

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