ラマン分光法による(Ca_XLa_<1-X>)(Ba_<1.75-X>La_<0.25+X>)Cu_3O_<7+δ>の局所構造変化の観察 Observation of Local Crystal Structure Change in (Ca_XLa_<1-X>)(Ba_<1.75-X>La_<0.25+X>)Cu_3O_<7+δ> Tetragonal Superconductor Using Raman Scattering

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Polycrystalline samples of (Ca<SUB>x</SUB>La<SUB>1-x</SUB>)(Ba<SUB>1.75-x</SUB>La<SUB>0.25+x</SUB>)Cu<SUB>3</SUB>O<SUB>7+δ</SUB>(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-T<SUB>c</SUB> superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm<SUP>-1</SUP>, which did not appear on Raman spectra of tetragonal YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>6</SUB>, were observed. Based on the model that apical oxygen O(4) is displaced by La<SUP>3+</SUP> on Ba site and the result of group theoretical analysis for this model, the 565 cm<SUP>-1</SUP> 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 La<SUP>3+</SUP> on Ba site, resulting in a change of local structure.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 49(5), 372-376, 2002-05-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10008559513
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    6169323
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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