Electrical transport signatures of metallic surface state formation in the strongly-correlated insulator FeSb2
arxiv(2024)
摘要
We present local and nonlocal electrical transport measurements of the
correlated insulator FeSb_2. By employing wiring configurations that
delineate between bulk- and surface-dominated conduction, we reveal the
formation of a metallic surface state in FeSb_2 for temperatures ⪅
5 K. This result is corroborated by an angular rotation study of this
material's magnetotransport, which also shows signatures of the transition from
bulk- to surface-dominated conduction over the same temperature interval as the
local/nonlocal transport divergence. Notable similarities with the topological
Kondo insulator candidate SmB_6 are discussed.
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