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Superconductivity in 3R-Ta1−xMxSe2 (M = W, Mo)

Author(s): Luo, Huixia; Xie, Weiwei; Seibel, Elizabeth M; Cava, Robert J

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Abstract: The 3-layer rhombohedral (3R) polytype of TaSe2−xTex is known to display a superconducting transition temperature that is between 6 and 17 times higher than that of the two-layer hexagonal (2H) polytype. The remarkable difference in Tc, although clearly associated with a difference in polytype, could have been due to an electronic effect specific to the Te–Se substitution. Here we report that small amounts of Mo or W doping lead to a 2H to 3R polytype transition in Ta1−xMoxSe2 and Ta1−xWxSe2. The 3R polytype materials are again found to have substantially higher Tc (~2 K for Ta0.9W0.1Se2 and Ta0.9Mo0.1Se2) than the 2H material (0.15 K), eliminating the possibility that any special characteristics of the Te/Se substitution are responsible for the dramatic difference in Tc. We infer that a three-layer stacking sequence is strongly preferred for superconductivity over a two-layer stacking sequence in the TaSe2 system.
Publication Date: 18-Aug-2015
Electronic Publication Date: 18-Aug-2015
Citation: Luo, Huixia, Xie, Weiwei, Seibel, Elizabeth M, Cava, RJ. (2015). Superconductivity in 3R-Ta1−xMxSe2 (M = W, Mo). Journal of Physics: Condensed Matter, 27 (36), 365701 - 365701. doi:10.1088/0953-8984/27/36/365701
DOI: doi:10.1088/0953-8984/27/36/365701
ISSN: 0953-8984
EISSN: 1361-648X
Pages: 365701 - 365701
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Physics: Condensed Matter
Version: Author's manuscript



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