Superconductivity And Charge Density Wave In Iodine-Doped Cuir2te4

We report a systematic investigation on the evolution of the structural and physical properties, including the charge density wave (CDW) and superconductivity of the polycrystalline CuIr2Te4-xIx for 0.0 <= x <= 1.0. X-ray diffraction results indicate that both of a and c lattice parameters increase linearly when 0.0 <= x <= 1.0. The resistivity measurements indicate that the CDW is destabilized with slight x but reappears at x >= 0.9 with very high T-CDW. Meanwhile, the superconducting transition temperature T-c enhances as x increases and reaches a maximum value of around 2.95 K for the optimal composition CuIr2Te1.9I0.1 followed by a slight decrease with higher iodine doping content. The specific heat jump (Delta C/gamma T-c) for the optimal composition CuIr2Te3.9I0.1 is approximately 1.46, which is close to the Bardeen-Cooper-Schrieffer value of 1.43, indicating that it is a bulk superconductor. The results of thermodynamic heat capacity measurements under different magnetic fields [C-p(T, H)], magnetization M(T, H) and magneto-transport rho(T, H) measurements further suggest that CuIr2Te4-xIx bulks are type-II superconductors. Finally, an electronic phase diagram for this CuIr2Te4-xIx system has been constructed. The present study provides a suitable material platform for further investigation of the interplay of the CDW and superconductivity.