Pressure-induced Fermi-liquid behavior in the Kondo insulator SmB6: Possible transition through a quantum critical point

S. Gabáni, E. Bauer, S. Berger, K. Flachbart, Y. Paderno, C. Paul, V. Pavlík, and N. Shitsevalova
Phys. Rev. B 67, 172406 – Published 19 May 2003
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Abstract

We have investigated the electrical resistivity of the intermediate valence narrow-gap semiconductor SmB6 at temperatures below 80 K and under pressure in the range between 1 bar and 70 kbar. We report on a continuous suppression of the gap under pressure, and on the observation of a critical point at pcr40kbar, characterizing the pressure induced transition from a Kondo insulator below pcr to a metallic heavy fermion liquid well above pcr. In the metallic phase close to pcr strong indications for a non-Fermi-liquid region, in which the electrical resistivity can be described by a power law ρ(T)=ρ0+ATn with 1<~n<~2, were observed.

  • Received 17 December 2002

DOI:https://doi.org/10.1103/PhysRevB.67.172406

©2003 American Physical Society

Authors & Affiliations

S. Gabáni1,2, E. Bauer2, S. Berger2, K. Flachbart1, Y. Paderno3, C. Paul2, V. Pavlík1, and N. Shitsevalova3

  • 1Institute of Experimental Physics, Slovak Academy of Sciences, SK-04353 Košice, Slovakia
  • 2Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria
  • 3Institute for Problems of Materials Science, UA-252680 Kiev, Ukraine

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Vol. 67, Iss. 17 — 1 May 2003

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