Raman scattering study of site substitution in RE1+xBa2-xCu3O7-δ (RE=Pr, La)

Y. T. Ren, Y. Y. Xue, Y. Y. Sun, C. W. Chu

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12 Citations (Scopus)

Abstract

Several samples of PrBa2Cu3O0.67, Pr1+xBa2-xCu3O7-δ and La1+xBa2-xCu3O7-δ have been synthesized and examined by X-ray diffraction and polarized micro-Raman scattering. The X-ray diffraction refinement results on these samples show a decrease of the Cu(2)-O(4)-Cu(1) bond length due to partial Ba-site substitution by large radius RE-ions. The Raman scattering shows an increase of the apical O(4) stretching frequency in agreement with the structure data. The increasing of the O(4) vibration frequency with the rare-earth induced bond-length changes can account for previous seemingly contradictory Raman results on PrBa2Cu3O7. An empirical relation was found between the effective force constant k for O(4) and the Cu(1)-Cu(2) spacing d: k∝d-6. The oxygen disorder induced peak at ∼ 600 cm-1 is also discussed.

Original languageEnglish
Pages (from-to)224-228
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume213
Issue number1-2
DOIs
Publication statusPublished - 1993 Aug 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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