Large linear magnetoresistance in the Dirac semimetal TlBiSSe

Understand

The mixed-chalcogenide compound TlBiSSe realizes a three-dimensional (3D) Dirac semimetal state.

• In clean, low-carrier-density single crystals of this material, we found Shubnikov-de Haas oscillations to signify its 3D Dirac nature.
• Moreover, we observed very large linear magnetoresistance (MR) approaching 10,000% in 14 T at 1.8 K, which diminishes rapidly above 30 K.
• Our analysis of the magnetotransport data points to the possibility that the linear MR is fundamentally governed by the Hall field; although such a situation has been predicted for highly-inhomogeneous systems, inhomogeneity does not seem to play an important role in TlBiSSe.