Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd: Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes

G. A. Kourouklis, A. Jayaraman, B. Batlogg, Robert Joseph Cava, M. Stavola, D. M. Krol, E. A. Rietman, L. F. Schneemeyer

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Abstract

We have studied the Cu-O vibrations in the MBa2Cu3O7 systems with M=Y,Eu,andGd by Raman spectroscopy. The observed Raman features are similar in the three systems. The four Raman bands in the 300-700 cm-1 frequency region exhibit isotopic shifts upon O18 substitution implying that these modes involve oxygen vibrations. In oxygen-deficient YBa2Cu3O7- samples prepared in the range 0< <0.7 within the orthorhombic structure, the A1g axial stretch mode is found to undergo both a softening and broadening with increasing oxygen deficiency. Furthermore, the Raman feature in the 550-600 cm-1 region shows an increase in intensity. The latter is attributed to disorder activation of the Cu-O chain mode, normally forbidden in the stoichiometric compound. These features and the emergence of a distinct Raman peak near 390 cm-1 in oxygen-deficient samples suggest that Raman spectroscopy could be used for characterizing oxygen stoichiometry of high-Tc superconductors.

Original languageEnglish (US)
Pages (from-to)8320-8324
Number of pages5
JournalPhysical Review B
Volume36
Issue number16
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Kourouklis, G. A., Jayaraman, A., Batlogg, B., Cava, R. J., Stavola, M., Krol, D. M., Rietman, E. A., & Schneemeyer, L. F. (1987). Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd: Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes. Physical Review B, 36(16), 8320-8324. https://doi.org/10.1103/PhysRevB.36.8320