Superconducting dome associated with the suppression and re-emergence of charge density wave states upon sulfur substitution in CuIr2Te4chalcogenides.

We report the path from the charge density wave (CDW)-bearing superconductor CuIr2Te4to the metal insulator transition (MIT)-bearing compound CuIr2S4by chemical alloying with the gradual substitution of S for Te. The evolution of structural and physical properties of the CuIr2Te4-xSx(0 ⩽x⩽ 4) polycrystalline system is systemically examined. The x-ray diffraction (XRD) results imply CuIr2Te4-xSx(0 ⩽x⩽ 0.5) crystallizes in a NiAs defected trigonal structure, whereas it adapts to the cubic spinel structure for 3.6 ⩽x⩽ 4 and it is a mixed phase in the doping range of 0.5 <x< 3.6. Unexpectedly, the resistivity and magnetization measurements reveal that small-concentration S substitution for Te can suppress the CDW transition, but it reappears aroundx= 0.2, and the CDW transition temperature enhances clearly asxaugments for 0.2 ⩽x⩽ 0.5. Besides, the superconducting critical temperature (Tc) first increases with S doping content and then decreases after reaching a maximumTc= 2.82 K for CuIr2Te3.85S0.15. MIT order has been observed in the spinel region (3.6 ⩽x⩽ 4) associated withTMIincreasing withxincreasing. Finally, the rich electronic phase diagram of temperature versusxfor this CuIr2Te4-xSxsystem is assembled, where the superconducting dome is associated with the suppression and re-emergence of CDW as well as MIT states at the end upon sulfur substitution in the CuIr2Te4-xSxchalcogenides.