Two-carrier transport-induced extremely large magnetoresistance in high mobility Sb2Se3.

Large magnetoresistance (MR) has been widely reported in the A₂B₃ (A=Sb or Bi; B=Se or Te) family of topological insulators (TIs). Sb₂Se₃is not a TI that was confirmed by the extracted zero Berry phase and the X-ray diffraction. An extremely large MR was observed in the Sb₂Se₃ crystals. This large MR increased quadratically with the magnetic field applied. The observed MR ratio was 830% at 10K and 9 T, which was larger than that previously reported for all A₂B₃ family TIs. This large MR originated from two carriers with high mobility. The inversely square root of the MR ratio was proportional to the resistance. [ABSTRACT FROM AUTHOR]