Resonance Raman scattering as a probe of oxygen dynamics in YBa2Cu3Ox

M. Käll, M. Osada, J. Bäckström, M. Kakihana, L. Börjesson, T. Frello, J. Madsen, N. H. Andersen, R. Liang, P. Dosanjh, W. N. Hardy

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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 et al. (Phys. Rev. Lett., 1991, 67, 3728) for x ≈ 1. 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 τ∼exp[Δ/kBT] with Δ ≈ 1 eV. The resulting temperature dependent equilibrium resonance intensity essentially mirrors the oxygen superstructure disordering around T* ≈ 100°C observed in the same crystals by hard X-ray diffraction, thus offering a new effective probe of chain-oxygen dynamics in YBa2Cu3Ox.

本文言語English
ページ(範囲)1988-1990
ページ数3
ジャーナルJournal of Physics and Chemistry of Solids
59
10-12
DOI
出版ステータスPublished - 1998 1月 1
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

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