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CaCu3Ge4O12及びCaCu3Sn4O12

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タイトル別名
  • Ferromagnetic Cuprates, CaCu3Ge4O12 and CaCu3Sn4O12, with A-site Ordered Perovskite Structures
  • Aサイト オーダー ペロブスカイトガタ コウゾウ オ モツ キョウジセイ ドウ サンカブツ CaCu3Ge4O12 オヨビ CaCu3Sn4O12

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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.

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