Aサイトオーダーペロブスカイト型構造を持つ強磁性銅酸化物CaCu_3Ge_4O_<12>及びCaCu_3Sn_4O_<12>

概要

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We succeeded in synthesizing A-site ordered perovskites, CaCu3Ge4O12 and CaCu3Sn4O12, under high pressure and high temperature conditions. The magnetic measurements revealed that these compounds are ferromagnets in contrast to the isostructural antiferromagnet, CaCu3Ti4O12. The ferromagnetism in CaCu3Ge4O12 and CaCu3Sn4O12 comes from the special alignment of CuO4 planes in the perovskite structure. On the other hand, the involvement of Ti-3d orbitals in magnetic interactions give rise to the antiferromagnetic superexchange interaction and it overcomes the ferromagnetic direct interaction in CaCu3Ti4O12. The finding demonstrates that either ferromagnetic or antiferromagnetic behavior can appear within the same structural framework.
社団法人粉体粉末冶金協会の論文
2008-02-15