Ln_2CuSnO_6(Ln=La, Pr, Nd, Sm)の高圧合成 High Pressure Synthesis of Ln_2CuSnO_6(Ln=La, Pr, Nd, Sm)

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La<SUB>2</SUB>CuSnO<SUB>6</SUB>, even though it contains CuO<SUB>2</SUB> layers, does not exhibit superconductivity. It might result from the in-plain Cu-O bond length being too long(about 2.0 Å, compared with 1.9 Å of La<SUB>2</SUB>CuO<SUB>4</SUB>). So, we replaced La with smaller atoms Pr, Nd, Sm, expecting that these might contract the CuO<SUB>2</SUB> layers and lead to superconductivity. For synthesis we used high pressure(6Gpa for Pr, Nd and 8Gpa for Sm). The result Is that, contrary to our wish, the CuO<SUB>2</SUB> layers buckled even more seriously and the Cu-O bond did not get shorter. In this paper, we focused on the magnetism of Ln<SUB>2</SUB>CuSnO<SUB>6</SUB>(Ln=La, Pr, Nd). In the temperature range of 150 to 350K, these compounds showed almost the same characteristics which have been explained assuming spin-canted weak ferromagnetism. However, Pr<SUB>2</SUB>CuSnO<SUB>6</SUB>and Nd<SUB>2</SUB>CuSnO<SUB>6</SUB>exhibited ferromagnetic behavior at lower temperature suggesting ordering of the Pr<SUP>3+</SUP>(Nd<SUP>3+</SUP>)moments. Antlferromagnetic coupling between the weak ferromagnetic CuO<SUB>2</SUB> layers and the ferromagnetic LnO layers has also been suggested.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 44(2), 127-131, 1997-02-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002013390
  • 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
    4139922
  • 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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