Tuning the Charge Density Wave and Superconductivity in Cuₓ TaS₂
Abstract
We report the characterization of layered 2H -type Cux TaS2 for 0≤x≤0.12. The charge density wave (CDW), at 70 K for TaS2, is destabilized with Cu doping. The sub-1 K superconducting transition in undoped 2H -TaS2 jumps quickly to 2.5 K at low x, increases to 4.5 K at the optimal composition Cu0.04 TaS2, 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 Cu0.04 TaS2. 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.
Recommended Citation
K. E. Wagner and E. Morosan and Y. S. Hor and J. Tao and Y. Zhu and T. Sanders and T. M. McQueen and H. W. Zandbergen and A. J. Williams and D. V. West and R. J. Cava, "Tuning the Charge Density Wave and Superconductivity in Cuₓ TaS₂," Physical review B: Condensed matter and materials physics, vol. 78, no. 10, American Physical Society (APS), Sep 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevB.78.104520
Department(s)
Physics
International Standard Serial Number (ISSN)
1098-0121
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2008 American Physical Society (APS), All rights reserved.
Publication Date
01 Sep 2008
