Abstract
Among the Iron chalcogenide superconductors, FeTe0.60Se0.40 shows highest transition temperature of 14.5K. The Magnetic relaxation studies have been performed on the high quality FeTe0.60Se0.40 single crystal. The time dependence of the magnetization (M) exhibits thermally activated flux motion and the magnetization relaxation rate 'S' increases with the temperature. The activation energy U(j) has been analyzed using the Maley's method and correlation between the scaled activation energy U and magnetization M suggests the applicability of the collective pinning model and crossover from the single vortex regime to the collective bundle pinning regime in this compound.
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