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  • Title: Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb2.
    Author: Xu KJ, Chen SD, He Y, He J, Tang S, Jia C, Yue Ma E, Mo SK, Lu D, Hashimoto M, Devereaux TP, Shen ZX.
    Journal: Proc Natl Acad Sci U S A; 2020 Jul 07; 117(27):15409-15413. PubMed ID: 32571928.
    Abstract:
    The resistance of a conventional insulator diverges as temperature approaches zero. The peculiar low-temperature resistivity saturation in the 4f Kondo insulator (KI) SmB6 has spurred proposals of a correlation-driven topological Kondo insulator (TKI) with exotic ground states. However, the scarcity of model TKI material families leaves difficulties in disentangling key ingredients from irrelevant details. Here we use angle-resolved photoemission spectroscopy (ARPES) to study FeSb2, a correlated d-electron KI candidate that also exhibits a low-temperature resistivity saturation. On the (010) surface, we find a rich assemblage of metallic states with two-dimensional dispersion. Measurements of the bulk band structure reveal band renormalization, a large temperature-dependent band shift, and flat spectral features along certain high-symmetry directions, providing spectroscopic evidence for strong correlations. Our observations suggest that exotic insulating states resembling those in SmB6 and YbB12 may also exist in systems with d instead of f electrons.
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