Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb2

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Abstract/Contents

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.

Type of resource	software, multimedia
Date created	May 2020

Related Publication	Xu, Ke-Jun and Chen, Su-Di and He, Yu and He, Junfeng and Tang, Shujie and Jia, Chunjing and Ma, Eric Yue and Mo, Sung-Kwan and Lu, Dong-Hui and Hashimoto, Makoto and Devereaux, Thomas P. and Shen, Zhi-Xun. (2018). Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb2. arXiv. https://arxiv.org/abs/1811.02183v3
Location	https://purl.stanford.edu/bb817cf2658

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Preferred Citation: Xu, Ke-Jun and Chen, Su-Di and He, Yu and He, Junfeng and Tang, Shujie and Jia, Chunjing and Ma, Eric Yue and Mo, Sung-Kwan and Lu, Dong-Hui and Hashimoto, Makoto and Devereaux, Thomas P. and Shen, Zhi-Xun. (2020). Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb2. Stanford Digital Repository. Available at: https://purl.stanford.edu/bb817cf2658

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