YBa_<2-x>Sr_xCu_3O_<7-d>における酸素の無秩序化と電荷移動効果 Oxygen Disordering and Charge Transfer Effect in YBa_<2-x>Sr_xCu_3O_<7-d>

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We have investigated neutron powder diffraction of YBa<SUB>2-x</SUB>Sr<SUB>x</SUB>Cu<SUB>3</SUB>O<SUB>7-d</SUB> with x=0, 0.4, 0.8 and 1. Their Rietveld analyses were carried out in space group Pmmm assuming two different disordering models: Model A where the O(1) is displaced from (0, 1/2, 0) to (x, 1/2, 0) so that each alternate chain has some kind of zig-zag chain and Model B where the available oxygen atoms are located at both the O(1) and 0(5) sites to give full and empty Cu-0 chains along the a-axis. The refinements based on model B have revealed that substitution of Sr for Ba causes an increase of isotropic temperature factor for the O(1), indicating an increasing in local oxygen disordering. This disordering in the model B is consistent with the Raman results that the defect induced mode gains intensity with increasing Sr content. A possible picture of the slight decrease of T<SUB>c</SUB> in YBa<SUB>2-x</SUB>Sr<SUB>x</SUB>Cu<SUB>3</SUB>O<SUB>7-d</SUB> is discussed in terms of both local oxygen disordering and associated charge-transfer effect.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 43(2), 195-199, 1996-02-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002011307
  • 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
    3926718
  • 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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