^<31>P-NMR and μSR Studies of Filled Skutterudite Compound SmFe_4P_<12> : Evidence for Heavy Fermion Behavior with Ferromagnetic Ground State(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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The ^<31>P-NMR (nuclear magnetic resonance) and μSR (muon spin relaxation) measurements on the filled skutterudite system SmFe_4P_<12> have been carried out. The temperature T dependence of the ^<31>P-NMR spectra indicates the existence of the crystalline electric field effect splitting of the Sm^<3+> (J=5/2) multiplet into a ground state and an excited state of about 70K. The spin-lattice relaxation rate 1/T_1 shows the typical behavior of the Kondo system, i.e., 1/T_1 is nearly T independent above 30K, and varies in proportion to T (the Korringa behavior, 1/T_1 ∝ T) between 7.5 and 30K. The T dependence deviated from the Korringa behavior below 7.5K, which is independent of T in the applied magnetic field of 1kOe, and suppressed strongly in higher fields. The behavior is explained as 1/T_1 is determined by ferromagnetic fluctuations of the uncovered Sm^<3+> magnetic moments by conduction electrons. The μSR measurements in zero field show the appearance of a static internal field associated with the ferromagnetic order below 1.6K.
- 社団法人日本物理学会の論文
- 2006-12-15
著者
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SEKINE Chihiro
Department of Electric and Electronic Engineering, Muroran Institute of Technology
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SHIROTANI Ichimin
Department of Electric and Electronic Engineering, Muroran Institute of Technology
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Kohori Yoh
Department Of Physics Graduate School Of Science Chiba University
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Sekine Chihiro
Faculty Of Engineering Muroran Institute Of Technology
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Sekine Chihiro
Muroran Institute Of Technology
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Giri Ram
Department Of Electrical And Electronic Engineering Muroran Institute Of Technology
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WATANABE Isao
Advanced Meson Science Laboratory, RIKEN
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HACHITANI Kenichi
Graduate School of Science and Technology, Chiba University
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FUKAZAWA Hideto
Graduate School of Science and Technology, Chiba University
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KOHORI Yoh
Graduate School of Science and Technology, Chiba University
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YOSHIMITSU Yuichi
Division of Physics, Graduate School of Science, Hokkaido University
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KUMAGAI Ken-ichi
Division of Physics, Graduate School of Science, Hokkaido University
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Shirotani I
Department Of Electric And Electronic Engineering Muroran Institute Of Technology
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Shirotani Ichimin
Department Of Applied Science For Energy Muroran Institute Of Technology
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Fukazawa Hideto
Department Of Physics Graduate School Of Science Chiba University
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Koyama Keiichi
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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Hachitani Kenichi
Department Of Physics Graduate School Of Science Chiba University
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Watanabe Isao
Advanced Meson Science Laboratory Nishina Center Riken
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Yoshimitsu Yuichi
Division Of Physics Graduate School Of Science Hokkaido University
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Kumagai Ken-ichi
Division Of Physics Graduate School Of Science Hokkaido University
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Kohori Yoh
Graduate School Of Engineering Science Osaka University
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Sekine Chihiro
Department Of Electric And Electronic Engineering Muroran Institute Of Technology
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GIRI Ram
Department of Electrical and Electronic Engineering, Muroran Institute of Technology
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