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Doped Iron Chalcogenide (FeCh) superconductors are extensively studied in thecontext of topological superconductivity. However, the evidence of topologicalsurface states in electrical transport measurements of the doped FeCh system isyet warranted. In the present letter, we performed angle-dependent magnetotransport measurements on a single crystal of a doped FeCh system, i.e.,FeSe$_{0.5}$Te$_{0.5}$. A non-saturating linear magnetoresistance (MR) has beenobserved under the magnetic field up to 14 T in the normal state ofFeSe$_{0.5}$Te$_{0.5}$. The MR is shown to possess anisotropy, which indicatesthe presence of topological surface states in FeSe$_{0.5}$Te$_{0.5}$.Angle-dependent Magneto-conductivity (MC) at low magnetic fields has beenmodelled by Hikami Larkin Nagaoka (HLN) formalism, which shows the presence ofweak antilocalization (WAL) effect in FeSe$_{0.5}$Te$_{0.5}$. The observed WALeffect is found to be 2D in nature through angle-dependent magneto transportmeasurements. Theoretical calculations based on Density Functional Theory (DFT)are also performed to get more confidence on the presence of topologicalsurface states in FeSe$_{0.5}$Te$_{0.5}$.

Normal state magneto transport properties of FeSe$_{0.5}$Te$_{0.5}$ superconductor: The role of topological surface states