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We report the characterization of layered, 2H-type CuxTaS2, for x between 0and 0.12. The charge density wave (CDW), at 70 K for TaS2, is destabilized withCu doping. The sub-1K superconducting transition in undoped 2H-TaS2 jumpsquickly to 2.5 K at low x, increases to 4.5 K at the optimal compositionCu0.04TaS2, and then decreases at higher x. The electronic contribution to thespecific heat, first increasing and then decreasing as a function of Cucontent, is 12 mJ mol-1 K-2 at Cu0.04TaS2. Electron diffraction studies showthat the CDW remains present at the optimal superconducting composition, butwith both a changed q vector and decreased coherence length. We present anelectronic phase diagram for the system.

Tuning the Charge Density Wave and Superconductivity in CuxTaS2