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Low-temperature surface conduction in the Kondo insulator SmB6

  • Author(s): Wolgast, S
  • Kurdak, C
  • Sun, K
  • Allen, JW
  • Kim, DJ
  • Fisk, Z
  • et al.

We study the transport properties of the Kondo insulator SmB 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 SmB , to be strong evidence for the topological insulator metallic surface states recently predicted for this material. © 2013 American Physical Society. 6 6

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