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Study of localized character of 4 f electrons and ultrasonic dispersions in SmOs4Sb12 by high-pressure high-frequency ultrasonic measurements
| Title: | Study of localized character of 4 f electrons and ultrasonic dispersions in SmOs4Sb12 by high-pressure high-frequency ultrasonic measurements |
| Authors: | Mombetsu, S. Browse this author | | Murazumi, T. Browse this author | | Hidaka, H. Browse this author | | Yanagisawa, T. Browse this author | | Amitsuka, H. Browse this author | | Ho, P. -C. Browse this author | | Maple, M. B. Browse this author |
| Issue Date: | 25-Aug-2016 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 94 |
| Issue: | 8 |
| Start Page: | 085142 |
| Publisher DOI: | 10.1103/PhysRevB.94.085142 |
| Abstract: | We present high-frequency ultrasonic measurements on the filled skutterudite SmOs4Sb12 under hydrostatic pressure. The results clarify that the 4f electrons in this compound transform from delocalized at ambient pressure to localized at high pressures with a crossover pressure of approximately 0.7 GPa. This drastic change in the 4f electrons under pressure is apparently related to the non-Fermi-liquid state, which appears in an intermediate-pressure range of 0.5-1.5 GPa. The results of our analysis strongly suggest that the ferro-octupolar interaction becomes dominant at high pressure. Moreover, we report the pressure dependence of the ultrasonic dispersion, which is due to rattling, over a wide range of ultrasonic frequencies up to 323 MHz. The drastic change in the ultrasonic dispersions and the frequency-dependent elastic anomaly in the C-11 mode at lower temperatures imply a possible coupling between rattling phonons and 4f electrons. |
| Rights: | ©[2016] American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/63045 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 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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