[en] Raman spectra of high-temperature superconducting materials composed of Y-Ba-Cu-O compounds are reported for the first time. These spectra show numerous lattice modes which are attributed both to the superconducting phase YBa2Cu3O/sub x/ and also to the impurity phases of BaCuO2 and Y2BaCuO5. Raman spectroscopy is shown to be a sensitive probe of both the phonon structure of the superconductor and of the impurity phases in the material
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