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Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12
| 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 | | rattling | | 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) |
| URI: | http://hdl.handle.net/2115/45356 |
| Appears in Collections: | 創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 柳澤 達也
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