Magnetotransport study of topological superconductor CuBiSe single crystal.

We report a magnetotransport study of vortex-pinning in CuBiSe single crystal. The sample is demonstrated to be in clean limit and absent of Pauli spin-limiting effect. Interestingly, the resistivity versus magnetic field shows an anomalously pronounced increase when approaching the superconducting-normal state boundary for both [Formula: see text] and [Formula: see text] configurations. We have investigated the flux-flowing behavior under various magnetic fields and temperatures, enabling us to establish its anisotropic vortex phase diagram. Our results suggest the CuBiSe can be served as one unique material for exploring exotic surface vortex states in topological superconductors.