2002-3

遍歴4f電子メタ磁性体Ce(Fe_1-xCo_x)₂の強磁場低温Ｘ線回折
X-ray Diffraction Study on the Itinerant 4f-Electron Metamagnet Ce(Fe_1-xCo_x)₂ in High Fields at Low Temperatures

低温・磁場中での粉末Ｘ線回折実験により，Ce(Fe_1-xCo_x)₂における磁場誘起の結晶構造変化，および磁場中での磁気体積効果を明らかにした．磁場の印加により，メタ磁性転移を伴って，基底状態の菱面体構造がＣ-15型立方晶構造へ変化することが分かった．

九州共立大学　工学部：牧原義一，梅田和巳
広島大学　自然科学研究支援開発センター：藤井博信
東北大学　金属材料研究所：小山佳一，渡辺和雄

The field induced structural transition and the magneto-volume effect in the itinerant 4f-electron metamagnet Ce(Fe_1-xCo_x)₂ have been investigated by powder x-ray diffraction measurements in high magnetic fields at low temperatures. We found that the rhombohedral structure in the ground state changed to the C15-type cubic structure by applying magnetic field, accompanied by a metamagnetic transition.

Physics Dept., Kyushu Kyoritsu University: Y. Makihara, K. Umeda
N-BARD, Hiroshima University: H. Fujii
IMR, Tohoku University: K. Koyama, K. Watanabe
Referrence: Y. Makihara, K. Koyama, K. Fukushima, K. Watanabe, H. Fujii,
"X-ray diffraction study on Ce(Fe_1-xCo_x)₂ in high field at low temperature", to be published in J. Magn. Magn. Mater.