Ferromagnetic cuprates Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12 with a -site ordered perovskite structure

H. Shiraki, T. Saito, Takahiro Yamada, M. Tsujimoto, M. Azuma, H. Kurata, S. Isoda, M. Takano, Y. Shimakawa

研究成果: Article査読

60 被引用数 (Scopus)

抄録

A -site ordered perovskites Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, which are isostructural to antiferromagnetic Ca Cu3 Ti4 O12, were found to be ferromagnets. The special alignment of the Cu O4 planes in the perovskite structure plays an important role in the magnetic properties of Cu2+ spins. Direct exchange interaction gives rise to the ferromagnetic behavior in Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, whereas involvement of Ti-3d orbitals produces the antiferromagnetic superexchange interaction in Ca Cu3 Ti4 O12. This finding demonstrates that either ferromagnetic or antiferromagnetic behavior can appear within the same structural framework.

本文言語English
論文番号140403
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
76
14
DOI
出版ステータスPublished - 2007 10 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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