Synthesis and magnetic property of Cu2GeO4 containing edge-sharing CuO2 chains.
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- Yamada Takahiro
- Inst. Chem. Res., Kyoto University
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- Hiroi Zenji
- Inst. Chem. Res., Kyoto University
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- Takano Mikio
- Inst. Chem. Res., Kyoto University
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- Nohara Minoru
- Inst. Solid State Physics, University of Tokyo
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- Takagi Hidenori
- Inst. Solid State Physics, University of Tokyo
Bibliographic Information
- Other Title
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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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Description
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.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 45 (12), 1136-1141, 1998
Japan Society of Powder and Powder Metallurgy
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Keywords
Details 詳細情報について
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- CRID
- 1390282681284926208
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- NII Article ID
- 10002053371
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4629448
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed