Tuning the charge density wave and superconductivity in Cux TaS2

K. E. Wagner; E. Morosan; Y. S. Hor; J. Tao; Y. Zhu; T. Sanders; T. M. McQueen; H. W. Zandbergen; A. J. Williams; D. V. West; R. J. Cava

doi:10.1103/PhysRevB.78.104520

Tuning the charge density wave and superconductivity in Cu_x TaS₂

K. E. Wagner, E. Morosan, Y. S. Hor, J. Tao, Y. Zhu, T. Sanders, T. M. McQueen, H. W. Zandbergen, A. J. Williams, D. V. West, R. J. Cava

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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.

Original language	English (US)
Article number	104520
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.78.104520
State	Published - Sep 18 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.78.104520

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title = "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.",

author = "Wagner, {K. E.} and E. Morosan and Hor, {Y. S.} and J. Tao and Y. Zhu and T. Sanders and McQueen, {T. M.} and Zandbergen, {H. W.} and Williams, {A. J.} and West, {D. V.} and Cava, {R. J.}",

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T1 - Tuning the charge density wave and superconductivity in Cux TaS2

AU - Wagner, K. E.

AU - Morosan, E.

AU - Hor, Y. S.

AU - Tao, J.

AU - Zhu, Y.

AU - Sanders, T.

AU - McQueen, T. M.

AU - Zandbergen, H. W.

AU - Williams, A. J.

AU - West, D. V.

AU - Cava, R. J.

PY - 2008/9/18

Y1 - 2008/9/18

N2 - 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.

AB - 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.

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ER -

Tuning the charge density wave and superconductivity in Cu_x TaS₂

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