辺共有一次元鎖化合物Cu_2GeO_4の合成と磁性 Synthesis and magnetic property of Cu_2GeO_4 containing edge-sharing CuO_2 chains

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Polycrystals of Cu<SUB>2</SUB>GeO<SUB>4</SUB> have been synthesized under high pressure (4 GPa) and high temperature (900°C) conditions. It has the tetragonally distorted spinel structure with CuO<SUB>6</SUB> octahedra elongated along the c axis due to the Jahn-Teller effect. The crystal structure is apparently three-dimensional, but the major superexchange path is assumed to be one-dimensional along the edge sharing chains. In fact, the magnetic susceptibility of Cu<SUB>2</SUB>GeO<SUB>4</SUB> shows a broad maximum around 100 K and is well described as that of the S=1/2 Heisenberg antiferromagnetic chains with interaction J of 135 K. A small jump in the susceptibility curve is observed at 33 K, which is considered to be a sign of antiferromagnetic ordering. Moreover, specific heat measurements show a large sharp peak at the same temperature, suggesting a first-order phase transition. The effects of Mg substitution for Cu and Si substitution for Ge are also reported.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(12), 1136-1141, 1998-12-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002053371
  • 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
    4629448
  • 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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