Abstract
The temperature evolution of the upper critical field H c2(T) in the noncentrosymmetric superconductor PbTaSe2 was determined via resistivity measurements down to 0.5 K. A pronounced positive curvature in the H c2-T phase diagram was observed in the whole temperature range below T c . The Seebeck coefficient S(T) in the temperature range 5K ≤ T ≤ 350 K was found to be negative in sign, modest in magnitude and non-linear in temperature. In addition, the superconducting transition temperature T c under hydrostatic pressure shows a marked non-monotonic variation, decreasing initially with the applied pressure up to P c ∼5–10 kbar but then rising with further pressurization. The underlying physical mechanisms of all these findings have been discussed.
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Acknowledgments
The authors would like to thank N. E. Hussey, C. M. J. Andrew, C. Lester, A. F. Bangura, Xin Lu, Zengwei Zhu, Xiaofeng Jin for valuable discussions. This work was supported by the National Key Basic Research Program of China (Grant No. 2014CB648400) and by NSFC (Grant No. 11474080, 11104051, 11104053). X.X. would also like to acknowledge the auspices from the Distinguished Young Scientist Funds of Zhejiang Province (LR14A040001).
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Wang, J., Xu, X., Zhou, N. et al. Upward Curvature of the Upper Critical Field and the V-Shaped Pressure Dependence of T c in the Noncentrosymmetric Superconductor PbTaSe2 . J Supercond Nov Magn 28, 3173–3178 (2015). https://doi.org/10.1007/s10948-015-3177-4
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DOI: https://doi.org/10.1007/s10948-015-3177-4