Raman spectroscopic investigation of superconducting YBa2Cu3O7-x, semiconducting YBa2Cu3O6+x, and possible impurity phases

Mascarenhas, A.; Geller, S.; Xu, L. C.; Katayama-Yoshida, H.; Pankove, J. I.; Deb, S. K.
January 1988
Applied Physics Letters;1/18/1988, Vol. 52 Issue 3, p242
Academic Journal
A Raman spectroscopic investigation of specimens of superconducting YBa2Cu3O7-x and of the possible impurity phases YBa2Cu3O6+x (semiconductor), Y2BaCuO5, Y2Cu2O5, BaCuO2, CuO, Y2O3, and BaCO3 indicates that in the range 100–700 cm-1, there are six characteristic lines belonging to the superconductor. At 13 K, these lines are at 150, 338, 441, 507, 590, and 644 cm-1. Comparison of the Raman spectra of the superconductor and the semiconductor indicates a mode stiffening of the pair at 338 and 441 cm-1, but a mode softening of the pair at 507 and 590 cm-1. A factor group analysis leads to a tentative assignment of the Raman and infrared allowed modes.


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