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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1988-1990
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Volume59
Issue number10-12
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

Keywords

  • Oxygen dynamics
  • Raman resonance
  • YBaCuO

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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