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

Research output: Contribution to journalArticlepeer-review

60 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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