Abstract
Raman measurements in YBa2Cu3O x (x = 6.35 – 6.82) with Ortho-II/III superstructural ordering reveal intense phonon scattering due to an electronic resonance localized near oxygen vacancies in the CuO-chains. Below room-temperature the resonance can be photo-bleached in a manner similar to reported persistent photo-induced superconductivity effects, indicating photon-assisted oxygen ordering. By comparing Raman and x-ray diffraction data we establish a correlation between the stability of the photo-induced state and the superstructure formation in the CuO-chains.
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