Specific Heat Study on Sm-based Filled Skutterudite Phosphides SmT_4P_<12> (T=Fe, Ru and Os)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Sm-based filled skutterudite phosphides SmFe_4P_<12>, SmFe_4P_<12> and SmOs_4P_<12> synthesized at high temperatures and high pressures have been studied by specific heat measurements in magnetic fields. SmFe_4P_<12> shows an anomaly at 1.6K attributed to a ferromagnetic transition. SmRu_4P_<12> shows a metalinsulator transition at 16K. This transition consists of two successive transitions, which suggests orbital and antiferromagnetic orderings. SmOs_4P_<12> shows a sharp anomaly at 4.5K due to an antiferromagnetic ordering. We discuss the characteristic behavior of those phase transitions and the crystalline electric field state in SmT_4P_<12> (T=Fe, Ru and Os). Interestingly, the magnetic entropy of SmFe_4P_<12> have only 0.16Rln2 below the ferromagnetic ordering temperature. This suggests a strong spin fluctuation effect. On the other hand, the variation of magnetic entropy in SmRu_4P_<12> and SmOs_4P_<12> reaches to nearly Rln4 below the ordering temperature.
- 一般社団法人日本物理学会の論文
- 2005-03-15
著者
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Doi Yoshihiro
Division Of Chemistry Graduate School Of Science Hokkaido University
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Wakeshima Makoto
Division Of Chemistry Graduate School Of Science Hokkaido University
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Hinatsu Yukio
Division Of Chemistry Graduate School Of Science Hokkaido University
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Giri Ram
Department Of Electrical And Electronic Engineering Muroran Institute Of Technology
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MATSUHIRA Kazuyuki
Faculty of Engineering, Kyushu Institute of Technology
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SHIMAYA Yousuke
Department of Electrical and Electronic Engineering, Muroran Institute of Technology
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Amitsuka Hiroshi
Division Of Physics Graduate School Of Science Hokkaido University
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Shirotani Ichimin
Department Of Applied Science For Energy Muroran Institute Of Technology
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Sekine Chihiro
Department Of Electric And Electronic Engineering Muroran Institute Of Technology
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