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Tuning the charge density wave and superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>TaS</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
We report the characterization of layered $2H$-type ${\text{Cu}}_{x}{\text{TaS}}_{2}$ for $0\ensuremath{\le}x\ensuremath{\le}0.12$. The charge density wave (CDW), at 70 K for ${\text{TaS}}_{2}$, is destabilized with Cu doping. The sub-1 K superconducting transition in undoped $2H{\text{-TaS}}_{2}$ jumps quickly to 2.5 K at low $x$, increases to 4.5 K at the optimal composition ${\text{Cu}}_{0.04}{\text{TaS}}_{2}$, …