SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: Other Materials
TT 10.3: Vortrag
Montag, 27. März 2023, 15:30–15:45, HSZ 204
Torque magnetometry of FeSi at low temperatures — •Carolina Burger, Vivek Kumar, Andreas Bauer, and Christian Pfleiderer — Physik-Departement, Technical University of Munich, D-85748 Garching, Germany
We report a study of the torque magnetization of the correlated small-band-gap semiconductor FeSi in the regime of the saturation of the resistivity at temperatures below a few Kelvin. The magnetic field dependence of the electrical transport properties provides strong circumstantial evidence of a high-mobility surface conduction channel, that is insensitive to the additional presence of an impurity band in the bulk [1, 2]. The surface conduction channel shares great similarities with properties reported for topological insulators, but displays a striking lack of sensitivity to the presence of ferromagnetic impurities as studied by means of a series of single crystals with slightly different starting compositions. We discuss the torque magnetization
observed in FeSi with respect to key characteristics observed in the field-polarized state of isostructural magnetic B20 compounds such as MnSi or Fe1−xCoxSi.
[1] Y. Fang, et al., Proc. Natl. Acad. Sci. 115, 8558 (2018)
[2] B. Yang, et al., Proc. Natl. Acad. Sci. 118, e2021203118 (2021)