Unusual Ferromagnetic-to-Antiferromagnetic-to-Ferromagnetic Transitions in Cu^<2+> (S=1/2) Cubic Spin Lattice of A-Site Ordered Perovskites(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Very unusual transitions from ferromagnetic CaCu_3Ge_4O_<12> to antiferromagnetic CaCu_3Ti_4O_<12> to ferromagnetic CaCu_3Sn_4O_<12> are observed in solid solutions of the A-site ordered perovskites. The effective magnetic interaction between Cu^<2+> spins changes gradually and systematically from ferromagnetic to antiferromagnetic to ferromagnetic in the solid solution. At intermediate compositions the perfect balance of the competing interactions causes unusual instability. The ferromagnetic-to-antiferromagnetic switching is different from the known change by the bond angles mechanism of the superexchange interaction and has not been observed previously in any ferromagnetic-antiferromagnetic compounds. The present solid solutions provide a unique system where either ferromagnetism or antiferromagnetim arises within the simple A-site cubic S=1/2 spin sublattice.
- 社団法人日本物理学会の論文
- 2008-11-15
著者
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SHIMAKAWA Yuichi
Institute for Chemical Research, Kyoto University
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Sugaya Takashi
Issp University Of Tokyo
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Shimakawa Yuichi
Institute For Chemical Research Kyoto University
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Shiraki Hiroshi
Institute For Chemical Research Kyoto University
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Saito Takashi
Institute For Chemical Research Kyoto University
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Shimakawa Yuichi
Kyoto Univ. Kyoto Jpn
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