Possible surface magnetism in the topological Kondo insulator candidate FeSi

Deng, Yuhang; Yan, Yifei; Wang, Haozhe; Lee-Wong, Eric; Moir, Camilla M.; Fang, Yuankan; Xie, Weiwei; Maple, M. Brian

doi:10.1103/physrevb.108.115158

Title: Possible surface magnetism in the topological Kondo insulator candidate FeSi

Journal Article · 27 September 2023 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.108.115158 · OSTI ID:2006874

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University of California, San Diego, CA (United States); University of California San Diego
University of Science and Technology of China, Anhui (China)
Michigan State University, East Lansing, MI (United States)
University of California, San Diego, CA (United States)

Our group has previously reported the existence of a conducting surface state (CSS) in FeSi, a candidate for a d-electron topological Kondo insulator (TKI), at low temperature. In this paper, we present the electrical transport properties of single crystals of FeSi studied in the phase space of temperature (T), magnetic field (B), and the angle (θ) between the electrical current and B. The normalized T-dependent electrical resistance (R) of a successively thinned FeSi crystal provides further confirmation of the existence of a CSS. We report that, in the CSS, the magnetoresistance (MR) exhibits a hysteresis loop bounded within ±0.5 T, suggesting two-dimensional magnetic ordering. The hysteretic MR is asymmetric in B and anisotropic with respect to θ. Further exploration of R(θ) at a fixed field of 9 T reveals an initial progressive rotation of the axis for twofold rotational symmetry from 2 to 10 K, then a stabilized axis for twofold symmetry until, at T > 40 K, the anisotropy vanishes, coincident with the disappearance of the CSS. Furthermore, these observations point to a possible magnetically ordered surface state that has been reported in similar systems such as FeSi nanofilms and bulk SmB₆.

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Research Organization:: University of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: NA0004086; SC0023648; FG02-04ER46105

OSTI ID:: 2006874

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 11 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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Title: Possible surface magnetism in the topological Kondo insulator candidate FeSi

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