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The missing hole packets near the Brillouin zone center render uniqueelectronic structures to the heavily electron doped FeSe-based superconductorswith Tc above 40 K. It challenges the existing scenario accounting for thenature of superconductivity in the iron-based family. Yet, one hurdle that hasto be overcome is the materials complexity in the rather limited number ofcompounds. Here we report the growth of heavily electron doped Li-NH3intercalated FeSe single crystals that are free of such complexities and allowaccess to the intrinsic superconducting properties. Our results show extremelylarge electronic anisotropy in both normal and superconducting states.Moreover, the anomalous transport properties appear in normal state, which arebelieved related to the anisotropy of relaxation time and/or temperaturedependent electron carrier concentration. In view of the great chemicalflexibility of intercalants, our findings provide novel platform tounderstanding of superconductivity origin of FeSe-related superconductors.

Extreme anisotropy and anomalous transport properties of heavily electron doped Lix(NH3)yFe2Se2 single crystals