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In the recently synthesized Li$_x$(NH$_2$)$_y$(NH$_3$)$_z$Fe$_2$Se$_2$ familyof iron chalcogenides a molecular spacer consisting of lithium ions, lithiumamide and ammonia separates layers of FeSe. It has been shown that uponvariation of the chemical composition of the spacer layer, superconductingtransition temperatures can reach $T_c\sim 44 \mathrm{K}$, but the relativeimportance of the layer separation and effective doping to the $T_c$enhancement is currently unclear. Using state of the art band structureunfolding techniques, we construct eight-orbital models from ab-initio densityfunctional theory calculations for these materials. Within an RPAspin-fluctuation approach, we show that the electron doping enhances thesuperconducting pairing, which is of $s_\pm$-symmetry and explain theexperimentally observed limit to $T_c$ in the molecular spacer intercalatedFeSe class of materials.

Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe