Synthesis and magnetic property of Cu2GeO4 containing edge-sharing CuO2 chains.

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  • 辺共有一次元鎖化合物Ｃｕ２ＧｅＯ４の合成と磁性
  • ヘン キョウユウ 1ジゲン サ カゴウブツ Cu2GeO4 ノ ゴウセイ ト

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Abstract

Polycrystals of Cu2GeO4 have been synthesized under high pressure (4 GPa) and high temperature (900°C) conditions. It has the tetragonally distorted spinel structure with CuO6 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 Cu2GeO4 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.

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