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 language | English |
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Pages (from-to) | 132-136 |
Number of pages | 5 |
Journal | Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy |
Volume | 55 |
Issue number | 2 |
DOIs | |
Publication status | Published - 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