  Here we report a systematic investigation on the evolution of the structural
and physical properties, including the charge density wave and
superconductivity of the polycrystalline CuIr2Te4-xIx. X-ray diffraction
results indicate that both of a and c lattice parameters increase linearly. The
resistivity measurements indicate that the charge density wave is destabilized
with slight x but reappears when x is large than 0.9. Meanwhile, the
superconducting transition temperature enhances as x raises and reaches a
maximum value of around 2.95 K for the optimal composition CuIr2Te3.9I0.1
followed by a slight decrease with higher iodine doping content. The specific
heat jump for the optimal composition CuIr2Te3.9I0.1 is approximately 1.46,
which is close to the Bardeen Cooper Schrieffer value which is 1.43, indicating
it is a bulk superconductor. The results of thermodynamic heat capacity
measurements under different magnetic fields, magnetization and
magneto-transport 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.
