Abstract
We report on the metastable photo-bleaching of the 2.15 eV yellow Raman resonance in oxygen deficient YBa 2Cu 3O x ( x=6.35–6.87), extending investigations by Wake et al. ( Phys. Rev. Lett., 1991, 67, 3728) for x≈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 τ∼exp[Δ/ k B T] 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 YBa 2Cu 3O x .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
