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  [in Japanese] 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  [in Japanese]

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Abstract

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.

Journal

  • Journal of the Japan Society of Powder and Powder Metallurgy

    Journal of the Japan Society of Powder and Powder Metallurgy 49(5), 372-376, 2002-05-15

    Japan Society of Powder and Powder Metallurgy

References:  15

Codes

  • NII Article ID (NAID)
    10008559513
  • NII NACSIS-CAT ID (NCID)
    AN00222724
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    05328799
  • NDL Article ID
    6169323
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-274
  • Data Source
    CJP  NDL  J-STAGE 
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