Negative differential resistance and quantum oscillations in FeSb2 with embedded antimony*

Project supported by Guangdong Innovative and Entrepreneurial Research Team Program, China (Grant No. 2016ZT06D348), the National Natural Science Foundation of China (Grant No. 11874193), and the Shenzhen Fundamental Subject Research Program, China (Grant Nos. JCYJ20170817110751776 and JCYJ20170307105434022). The work at Brookhaven is supported by the US Department of Energy, Office of Basic Energy Sciences as part of the Computational Material Science Program (material synthesis).
Tang Fangdong1, 2, Du Qianheng3, 4, Petrovic Cedomir3, 4, Zhang Wei1, He Mingquan5, Zhang Liyuan2, †
       

(a) Amplitudes of the dHvA oscillations at different temperatures after subtracting a polynomial background. (b) Theoretical analysis according to Lifshitz–Kosevich formulation of the dHvA amplitudes for α pocket with field applied along two different directions, which gives a cyclotron mass ∼ 0.1me. (c) Angular dependences [schematic diagram seen in Fig. 4(a) and 4(b)] of the three main frequencies in FFT analysis. The solid lines are the data of the rotation from trigonal axis to bisectrix axis taken from Ref. [41]. The dashed line is a guiding line of the inverse cosine function. (d) The comparison of the scaled frequency spectra between S2 polished 1 (containing embedded Sb) and S2 polished 2 (no Sb) with added Sb.