Magnetotransport Studies of topological Sb_2Te_(2-x)Se_x Single Crystal

Abstract

We have studied the magnetotransport properties of a topological compound, Sb2Te2-xSex. The electrical resistance decreases with temperature showing the metallic behavior. Magnetoresistance (MR) increases with increasing magnetic field, and it reaches a value as high as 300 % at 14 T without showing any sign of saturation. At higher fields, MR shows clear Shubnikov de Haas (SdH) oscillations with a single frequency near 178 T. In addition, there appears a tiny peak near 24 T in the frequency spectrum. We have also analyzed the temperature-dependent quantum oscillations using the Lifshitz-Kosevich theory and calculated several physical parameters characterizing the SdH oscillations. The possible origin of the low frequency at 24 T will also be discussed.