Modulated Crystal Structure and Spin/Hole Arrangement in the Chain Compound Ca_xCuO_2 (x=0.8240)
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概要
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The crystal structure of Ca_xCuO_2(x=0.8240) has been studied by the Rietveld refinement of X-ray diffraction data using a modulated-structure analysis technique. Hole distribution was determined by bond-valence sum calculation using the obtained Cu-O inter-atomic distances. The results revealed that every third Cu site along a chain tends to be occupied by a hole. Furthermore, it was found that the Cu-O-Cu bond-angles for hole-unoccupied Cu sites are smaller than 90℃. This suggests that the nearest-neighbor magnetic interaction J_1 is ferromagnetic and its magnitude is comparable to the next nearest-neighbor antiferromagnetic interaction J_2. Based on the obtained hole distribution and the signs of the magnetic interactions between spins, we proposed a possible spin/hole arrangement model in the chain, which includes a main sequence of…↑○↓↓○↑…in most parts of the chain.
- 社団法人日本物理学会の論文
- 2002-03-15
著者
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Kimoto K
Advanced Electron Microscope Group Advanced Nano- Characterization Center National Institute For Mat
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Kimoto Koji
Hitachi Research Laboratory Hitachi Ltd.
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Kimoto Koji
Advanced Electron Microscope Group Advanced Nano- Characterization Center National Institute For Mat
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Kimoto K
Hitachi Ltd. Ibaraki Jpn
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TAKAYAMA-MUROMACHI Eiji
Advanced Materials Lab., National Institute of Materials
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Isobe Masaaki
Advanced Materials Laboratory National Institute For Materials Science (aml
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Kimoto Koji
National Institute For Materials Science
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Kimoto Koji
Advance Materials Laboratory National Institute For Materials Science
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Kimoto Koji
Nims)
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Takayama-muromachi Eiji
Advanced Materials Laboratory National Institute For Materials Science (aml
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Kimoto Koji
Advanced Materials Laboratory National Institute For Materials Science
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Takayama-muromachi Eiji
Advanced Materials Lab. National Institute Of Materials
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Kimoto Koji
Hitachi Research Laboratory Hitachi Ltd
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