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Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12

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Title: Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12
Authors: Yanagisawa, Tatsuya Browse this author →KAKEN DB
Ikeda, Yoichi Browse this author
Saito, Hitoshi Browse this author
Hidaka, Hiroyuki Browse this author
Amitsuka, Hiroshi Browse this author
Araki, Koji Browse this author
Akatsu, Mitsuhiro Browse this author
Nemoto, Yuichi Browse this author
Goto, Terutaka Browse this author
Ho, Pei-Chun Browse this author
Baumbach, Ryan E. Browse this author
Maple, M. Brian Browse this author
Keywords: filled skutterudite
heavy fermion
elastic constant
ultrasonic dispersion
Issue Date: 2011
Publisher: Physical Society of Japan
Journal Title: Journal of the Physical Society of Japan
Volume: 80
Issue: 4
Start Page: 043601
Publisher DOI: 10.1143/JPSJ.80.043601
Abstract: 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.
Description: LETTERS
Rights: ©2011 The Physical Society of Japan
Type: article (author version)
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柳澤 達也

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