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Temperature dependence of the upper critical magnetic field (Hc2) of singlecrystalline FeTe0.5Se0.5 (Tc = 14.5 K) have been determined by tunnel diodeoscillator-based measurements in magnetic fields of up to 55 T and temperaturesdown to 1.6 K. The Werthamer-Helfand-Hohenberg model accounts for the data formagnetic field applied both parallel (H || ab) and perpendicular (H || c) tothe iron conducting plane, in line with a single band superconductivity.Whereas Pauli pair breaking is negligible for H || c, Pauli contribution isevidenced for H || ab with Maki parameter alpha= 1.4, corresponding to Paulifield HP = 79 T. As a result, the Hc2 anisotropy (= Habc2 /Hcc2) which isalready rather small at Tc (gamma = 1.6) further decreases as the temperaturedecreases and becomes smaller than 1 at liquid helium temperatures.

Tunnel diode oscillator measurements of the upper critical magnetic field of FeTe0:5Se0:5