Study of localized character of 4f electrons and ultrasonic dispersions in SmOs4Sb12 by high-pressure high-frequency ultrasonic measurements

S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa, H. Amitsuka, P.-C. Ho, and M. B. Maple
Phys. Rev. B 94, 085142 – Published 24 August 2016

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 C11 mode at lower temperatures imply a possible coupling between rattling phonons and 4f electrons.

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  • Received 30 March 2016
  • Revised 1 August 2016

DOI:https://doi.org/10.1103/PhysRevB.94.085142

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa*, and H. Amitsuka

  • Department of Physics, Hokkaido University, Sapporo 060-0810, Japan

P.-C. Ho

  • Department of Physics, California State University, Fresno, California 93740, USA

M. B. Maple

  • Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA

  • *Corresponding author: tatsuya@phys.sci.hokudai.ac.jp

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Issue

Vol. 94, Iss. 8 — 15 August 2016

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