Abstract
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.
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