The study of transport and magnetic properties of FeTe_0.60Se_0.40single crystals grown by the self-flux method.

Iron chalcogenide (FeCh) superconductors have become one of the most investigated superconducting materials because of their good crystalline symmetry, complex electronic and magnetic phase diagrams. They provide a platform for studying correlated quantum matter. Recently topological superconductivity has been discovered in FeCh superconductors. But to support the existence of topological surface states, electrical transport investigations are required. In this approach, we have studied structural, transport, and magnetic properties of synthesized FeTe_0.60Se_0.40 single crystals grown by self-flux method. The structural properties show the pure tetragonal phase of the grown single crystal and alignment of the layer in c-axis. Transport and magnetic studies demonstrate the anisotropy in the grown single crystal and confirm the transition temperature T_c~14 K. Moreover, linear magnetoresistance at 16 K in the high field region has been observed for field H || c but not detected in the direction H || ab, indicating the presence of topological surface states. Our work will be useful in developing FeCh superconductors with good superconducting properties, and the intrinsic topological superconductivity is relevant for implementing quantum computing devices.