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We report on the upper critical field B_c2 of a superconducting LiFeAs singlecrystal with T_c~16 K, determined from magnetic torque measurements indc-magnetic fields up to 35 T and at temperatures down to 0.3 K. B_c2 at 0.3 Kis obtained to be 26.4 T and 15.5 T for the applied field B_a||ab and B_a||c,respectively. The anisotropy parameter $\Gamma$=$B_c2^ab / B_c2^c$ is ~ 3 atT_c and decreases to 1.7 as $T \rightarrow 0$, showing rather isotropicsuperconductivity. While B_c2 is orbitally-limited for B_a||c, thespin-paramagnetic effect is evident in the temperature dependence of B_c2 forB_a||ab

Determination of the Upper Critical Field of a Single Crystal LiFeAs: The Magnetic Torque Study up to 35 Tesla