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Low-temperature surface conduction in the Kondo insulator SmB6

Steven Wolgast1, Çağlıyan Kurdak1, Kai Sun1, J. W. Allen1, Dae-Jeong Kim2, and Zachary Fisk2

  • 1Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 2Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697, USA

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Phys. Rev. B 88, 180405(R) – Published 27 November, 2013

DOI: https://doi.org/10.1103/PhysRevB.88.180405

Abstract

We study the transport properties of the Kondo insulator SmB6 with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the material is cooled below 4 K, it exhibits a crossover from bulk to surface conduction with a fully insulating bulk. We take the robustness and magnitude of the surface conductivity, as is manifest in the literature of SmB6, to be strong evidence for the topological insulator metallic surface states recently predicted for this material.

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Phys. Rev. B 88, 180405(R)– Published 27 November, 2013
  • Received 17 June 2013

©2013 American Physical Society

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