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We report structurally tuned superconductivity in KxFe2-ySe2-zSz (0<=z<=2)phase diagram. Superconducting Tc is suppressed as S is incorporated into thelattice, eventually vanishing at 80% of S. The magnetic and conductivityproperties can be related to stoichiometry on poorly occupied Fe1 site and thelocal environment of nearly fully occupied Fe2 site. The decreasing Tccoincides with the increasing Fe1 occupancy and the overall increase in Festoichiometry from z = 0 to z = 2. Our results indicate that the irregularityof Fe2-Se/S tetrahedron is an important controlling parameter that can be usedto tune the ground state in the new superconductor family.

Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion