Observation of local crystal structure change in (CaxLa1-x)(Ba1.75-xLa0.25+x) Cu3O7+δ tetragonal superconductor using Raman scattering

Yasushi Sato, Kohtaro Yoshioka, Valery Petrykin, Masato Kakihana, Yoshito Tanaka, Ai Yamaguchi, Takahiro Katsumata, Hiroshi Yasuoka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Polycrystalline samples of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3 O7+δ (CLBCO) tetragonal superconductor for x from 0.0 to 0.6 were studied by Raman scattering technique, which is sensitive to oxygen site symmetry in the high-Tc superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm-1, which did not appear on Raman spectra of tetragonal YBa2Cu3O6, were observed. Based on the model that apical oxygen O(4) is displaced by La3+ on Ba site and the result of group theoretical analysis for this model, the 565 cm-1 mode which possessed the strongest intensity among these extra modes could be assigned to another O(4) vibration. This indicates that O(4) is strongly attracted by La3+ on Ba site, resulting in a change of local structure.

Original languageEnglish
Pages (from-to)372-376
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume49
Issue number5
DOIs
Publication statusPublished - 2002 May

Keywords

  • Amorphous citric acid method
  • Cation disordering
  • Cuprate superconductor
  • Local crystal structure
  • Raman scattering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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