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Kondo-like behavior near the magnetic instability in SmB6: Temperature and pressure dependences of the Sm valence

N. Emi, N. Kawamura, M. Mizumaki, T. Koyama, N. Ishimatsu, G. Pristáš, T. Kagayama, K. Shimizu, Y. Osanai, F. Iga, and T. Mito
Phys. Rev. B 97, 161116(R) – Published 30 April 2018
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Abstract

We report a systematic study of Sm valence in the prototypical intermediate valence compound SmB6. Sm mean valence vSm was measured by x-ray absorption spectroscopy as a function of pressure (1<P<13GPa) and temperature (3<T<300K). Pressure-induced magnetic order was detected above Pc=10GPa by resistivity measurements. A shift toward the localized 4f state with increasing P and/or T is evident from an increase in vSm. However vSm at Pc is anomalously far below 3, which differs from the general case of nonmagnetic-magnetic transition in Yb and Ce compounds. From the T dependence of vSm(P,T), we found that vSm(P,T) consists of two different characteristic components: One is associated with low-energy electronic correlations involving Kondo-like behavior, and the other is associated with high-energy valence fluctuations.

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  • Received 3 January 2018
  • Revised 15 March 2018

DOI:https://doi.org/10.1103/PhysRevB.97.161116

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

N. Emi1, N. Kawamura2, M. Mizumaki2, T. Koyama1, N. Ishimatsu3, G. Pristáš4, T. Kagayama5, K. Shimizu5, Y. Osanai6, F. Iga6,7, and T. Mito1,*

  • 1Graduate School of Material Science, University of Hyogo, Ako, Hyogo 678-1297, Japan
  • 2Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Sayo, Hyogo 679-5198, Japan
  • 3Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  • 4Institute of Experimental Physics, Slovak Academy of Sciences, 04001 Košice, Slovakia
  • 5KYOKUGEN, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 6College of Science, Ibaraki University, Mito Ibaraki 310-8512, Japan
  • 7Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki 310-8512, Japan

  • *mito@sci.u-hyogo.ac.jp

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Issue

Vol. 97, Iss. 16 — 15 April 2018

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