Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb 2
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.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1634232
- Alternate Identifier(s):
- OSTI ID: 1644321; OSTI ID: 1756342
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 117 Journal Issue: 27; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Xu, Ke-Jun, Chen, Su-Di, He, Yu, He, Junfeng, Tang, Shujie, Jia, Chunjing, Yue Ma, Eric, Mo, Sung-Kwan, Lu, Donghui, Hashimoto, Makoto, Devereaux, Thomas P., and Shen, Zhi-Xun. Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb 2. United States: N. p., 2020.
Web. doi:10.1073/pnas.2002361117.
Xu, Ke-Jun, Chen, Su-Di, He, Yu, He, Junfeng, Tang, Shujie, Jia, Chunjing, Yue Ma, Eric, Mo, Sung-Kwan, Lu, Donghui, Hashimoto, Makoto, Devereaux, Thomas P., & Shen, Zhi-Xun. Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb 2. United States. https://doi.org/10.1073/pnas.2002361117
Xu, Ke-Jun, Chen, Su-Di, He, Yu, He, Junfeng, Tang, Shujie, Jia, Chunjing, Yue Ma, Eric, Mo, Sung-Kwan, Lu, Donghui, Hashimoto, Makoto, Devereaux, Thomas P., and Shen, Zhi-Xun. Mon .
"Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb 2". United States. https://doi.org/10.1073/pnas.2002361117.
@article{osti_1634232,
title = {Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb 2},
author = {Xu, Ke-Jun and Chen, Su-Di and He, Yu and He, Junfeng and Tang, Shujie and Jia, Chunjing and Yue Ma, Eric and Mo, Sung-Kwan and Lu, Donghui and Hashimoto, Makoto and Devereaux, Thomas P. and Shen, Zhi-Xun},
abstractNote = {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.},
doi = {10.1073/pnas.2002361117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 27,
volume = 117,
place = {United States},
year = {Mon Jun 22 00:00:00 EDT 2020},
month = {Mon Jun 22 00:00:00 EDT 2020}
}
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https://doi.org/10.1073/pnas.2002361117
https://doi.org/10.1073/pnas.2002361117
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Cited by: 12 works
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