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

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)224-228
頁數5
期刊Physica C: Superconductivity and its applications
213
發行號1-2
DOIs
出版狀態Published - 1993 8月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程

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