Ferromagnetic cuprates, CaCu3Ge4O12 and CaCu3Sn4O12, with A-site ordered perovskite structures

Hiroshi Shiraki, Takashi Saito, Takahiro Yamada, Masahiko Tsujimoto, Masaki Azuma, Hiroki Kurata, Seiji Isoda, Mikio Takano, Yuichi Shimakawa

Research output: Contribution to journalArticlepeer-review

Abstract

We succeeded in synthesizing A - site ordered perovskites, CaCu 3Ge4O12 and CaCu3Sn 4O12, under high pressure and high temperature conditions. The magnetic measurements revealed that these compounds are ferromagnets in contrast to the isostructural antiferromagnet, CaCu3Ti 4O12. The ferromagnetism in CaCu3Ge 4O12 and CaCu3Sn4O12 comes from the special alignment of CuO4 planes in the perovskite structure. On the other hand, the involvement of Ti-3d orbitais in magnetic interactions give rise to the antiferromagnetic superexchange interaction and it overcomes the ferromagnetic direct interaction in CaCu3Ti 4O12. The finding demonstrates that either ferromagnetic or antiferromagnetic behavior can appear within the same structural framework.

Original languageEnglish
Pages (from-to)132-136
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume55
Issue number2
DOIs
Publication statusPublished - 2008 Feb

Keywords

  • CaCuGeO
  • CaCuSn O
  • Ferromagnetic cuprate
  • High pressure synthesis
  • Magnetic interaction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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