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

doi:10.2497/jjspm.55.132

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 journal › Article › peer-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 language	English
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	https://doi.org/10.2497/jjspm.55.132
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

Access to Document

10.2497/jjspm.55.132

Cite this

Ferromagnetic cuprates, CaCu₃Ge₄O₁₂ and CaCu₃Sn₄O₁₂, with A-site ordered perovskite structures. / Shiraki, Hiroshi; Saito, Takashi; Yamada, Takahiro; Tsujimoto, Masahiko; Azuma, Masaki; Kurata, Hiroki; Isoda, Seiji; Takano, Mikio; Shimakawa, Yuichi.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 55, No. 2, 02.2008, p. 132-136.

Research output: Contribution to journal › Article › peer-review

Shiraki, Hiroshi ; Saito, Takashi ; Yamada, Takahiro ; Tsujimoto, Masahiko ; Azuma, Masaki ; Kurata, Hiroki ; Isoda, Seiji ; Takano, Mikio ; Shimakawa, Yuichi. / Ferromagnetic cuprates, CaCu₃Ge₄O₁₂ and CaCu₃Sn₄O₁₂, with A-site ordered perovskite structures. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 2008 ; Vol. 55, No. 2. pp. 132-136.

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

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.",

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AU - Shiraki, Hiroshi

AU - Saito, Takashi

AU - Yamada, Takahiro

AU - Tsujimoto, Masahiko

AU - Azuma, Masaki

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AU - Isoda, Seiji

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AU - Shimakawa, Yuichi

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N2 - 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.

AB - 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.

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KW - CaCuSn O

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