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

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    66 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number140403
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume76
    Issue number14
    DOIs
    Publication statusPublished - 2007 Oct 11

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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