Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12
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概要
- 論文の詳細を見る
Elastic properties of the filled skutterudite compound SmOs4Sb12 have been investigated by ultrasonic measurements. The elastic constant C11(ω) shows two ultrasonic dispersions at ∼15 and ∼53 K for frequencies ω between 33 and 316 MHz, which follow a Debye-type formula with Arrhenius-type temperaturedependent relaxation times and remain unchanged even with applied magnetic fields up to 10 T. The corresponding activation energies were estimated to be E2 = 105 K and E1 = 409 K, respectively. The latter, E1, is the highest value reported thus far in the Sb-based filled skutterudites. The presence of magnetically robust ultrasonic dispersions in SmOs4Sb12 implies a possibility that an emergence of a magnetically insensitive heavy fermion state in this system is associated with a novel local charge degree of freedom, which causes the ultrasonic dispersion.
- 2011-04-15
著者
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Ho Pei-chun
Department Of Physics And Institute For Pure And Applied Physical Sciences University Of California:
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Maple M.
Department Of Physics And Institute For Pure And Applied Physical Sciences University Of California
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Goto Terutaka
Graduate School Of Science And Technology Niigata University
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Amitsuka Hiroshi
Department Of Physics Faculty Of Science Hokkaido University
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HIDAKA Hiroyuki
Department of Physics, Faculty of Science, Okayama University
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Nemoto Yuichi
Graduate School Of Science And Technology Niigata University
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Akatsu Mitsuhiro
Graduate School Of Science And Technology Niigata University
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Ikeda Yoichi
Department Of Chemistry Graduate School Of Pure And Applied Sciences University Of Tsukuba
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Saito Hitoshi
Department Of Anesthesiology And Critical Care Medicine Hokkaido University Graduate School Of Medic
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Amitsuka Hiroshi
Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
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Yanagisawa Tatsuya
Creative Research Institution, Hokkaido University, Sapporo 001-0021, Japan
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Araki Koji
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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Baumbach Ryan
Department of Physics, University of California, San Diego, La Jolla, CA 92093, U.S.A.
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Ho Pei-Chun
Department of Physics, California State University, Fresno, Fresno, CA 93740, U.S.A.
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Hidaka Hiroyuki
Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
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Maple M.
Department of Physics, University of California, San Diego, La Jolla, CA 92093, U.S.A.
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