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It is known that iron selenide superconductors exhibit unique characteristicsdistinct from iron pnicitides, especially in the electron-doped region.However, acomprehensive study of continuous carrier doping ang thecorresponding crystal structures of FeSe is still lacking, mainly due to thedifficulties in controlling the carrier density in bulk materials. Here, wereport the successful synthesis of a new family of bulk Lix(C3H10N2)0.37FeSe,which features a continue superconducting dome harboring Lifshitz transitionwithin the wide range of 0.06~0.68. We demonstrate that with electron-doped,the anion height of FeSe layers deviates lineraly away from the optimizedvalues of pnictides and pressurized FeSe. This feature leads to anewsuperconducting zone with unique doping dependence of the electronic structuresand strong orbital-selective electronic correlation. Optimal superconductivityis achieved when the Fe 3d t2g orbitals have almost the same intermediateelectronic correlation strength, with moderate mass enhancement between 3~4 inthe two separate superconducting zone. Our result shed light on archievingunified mechanism of superconductivity in iron-based materials.

Realization of continuously electron doping in bulk iron selenides and identification of a new superconducting zone