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Tuning the Charge Density Wave and Superconductivity in CuxTaS2

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arxiv 0808.2147 v1 pith:OJF52HID submitted 2008-08-15 cond-mat.supr-con

K.E. Wagner , E. Morosan , Y. S. Hor , J. Tao , Y. Zhu , T. Sanders , T.M. McQueen , H.W. Zandbergen
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A. J. Williams D.V. West R.J. Cava
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classification cond-mat.supr-con
keywords tas2chargecompositioncuxtas2densityelectronicoptimalsuperconducting
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We report the characterization of layered, 2H-type CuxTaS2, for x between 0 and 0.12. The charge density wave (CDW), at 70 K for TaS2, is destabilized with Cu doping. The sub-1K superconducting transition in undoped 2H-TaS2 jumps quickly to 2.5 K at low x, increases to 4.5 K at the optimal composition Cu0.04TaS2, and then decreases at higher x. The electronic contribution to the specific heat, first increasing and then decreasing as a function of Cu content, is 12 mJ mol-1 K-2 at Cu0.04TaS2. Electron diffraction studies show that the CDW remains present at the optimal superconducting composition, but with both a changed q vector and decreased coherence length. We present an electronic phase diagram for the system.

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