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In our tunneling investigation using Andreev superconductor - normal metal -superconductor contacts on LiFeAs single crystals we observed two reproducibleindependent subharmonic gap structures at dynamic conductance characteristics.From these results, we can derive the energy of the large superconducting gap$\Delta_L=(2.5 \div 3.4)$ meV and the small gap $\Delta_L=(0.9 \div 1)$ meV at$T = 4.2$ K for the $T_C^{local} \approx (10.5 \div 14)$ K (the contact areacritical temperature which deviation causes the variation of $\Delta_L$). TheBCS-ratio is found to be $2\Delta_L/k_BT_C = (4.6 \div 5.6)$, whereas$2\Delta_S/k_BT_C \ll 3.52$ results from induced superconductivity in the bandswith the small gap.

Investigation of LiFeAs by means of "Break-junction" Technique