Electronic phase diagram of Ta_1-xMo_xS₂ and optimization of superconductivity in a charge density wave system

Transition metal dichalcogenides are a family of quasi-2-dimensional quantum materials with a unique susceptibility to the variation of parameters such as pressure, chemical doping, disorder, etc. These materials have been extensively studied due to the wide variety of electronic ground states they can show. Of special interest are the compounds of this family that show charge density wave (CDW) ordering and superconductivity, since the exact mechanism for the stabilization and optimization of superconductivity in systems that show these two ground states is still an open question. In this talk we present experimental transport results in single crystals of the solid solution Ta_1-xMo_xS₂. We observe a suppression of the CDW transition temperature with increasing Mo content, accompanied by a strong enhancement of the superconducting transition temperature. We discuss our results in the context of the evolution of the electronic and structural properties of this solid solution as we approach the MoS₂ compound, and their relationship to the possible existence of a CDW quantum critical point.