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. 2016 Sep 6;7:12732. doi: 10.1038/ncomms12732

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Copyright © 2016, The Author(s)

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(a) CR spectra at 5 K at the designated frequencies. (b) Frequency versus magnetic field plot of the CR fields obtained from the data in a. Straight line gives a cyclotron effective mass m* of 5.4m₀ (where m₀ is the bare electron mass). (c) Band diagram of FeSb₂; a small energy gap Δ appears between the conduction and impurity bands¹⁵,¹⁸,²⁷. The conduction band may possess a steep band edge associated with the localized Fe 3d orbitals, leading to the large electron mass.