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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