Upward Curvature of the Upper Critical Field and the V-Shaped Pressure Dependence of Tc in the Noncentrosymmetric Superconductor PbTaSe2

被引：0
作者：
Jianrui Wang
Xiaofeng Xu
Nan Zhou
Lin Li
Xiaozhi Cao
Jinhu Yang
Yuke Li
Chao Cao
Jianhui Dai
Jinglei Zhang
Zhixiang Shi
Bin Chen
Zhihua Yang
机构：
[1] Hangzhou Normal University,Department of Physics and Hangzhou Key Laboratory of Quantum Matters
[2] Chinese Academy of Sciences,High Magnetic Field Laboratory
[3] Southeast University,Department of Physics
[4] University of Shanghai for Science & Technology,Department of Physics
[5] Xinjiang Technical Institute of Physics and Chemistry of Chinese Academy of Sciences,undefined
来源：
Journal of Superconductivity and Novel Magnetism | 2015年 / 28卷
关键词：
Superconductivity; Hydrostatic pressure; Upper critical field; Seebeck coefficient;
D O I：
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中图分类号：
学科分类号：
摘要：
The temperature evolution of the upper critical field Hc2(T) in the noncentrosymmetric superconductor PbTaSe2 was determined via resistivity measurements down to 0.5 K. A pronounced positive curvature in the Hc2-T phase diagram was observed in the whole temperature range below Tc. 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 Tc under hydrostatic pressure shows a marked non-monotonic variation, decreasing initially with the applied pressure up to Pc ∼5–10 kbar but then rising with further pressurization. The underlying physical mechanisms of all these findings have been discussed.
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页码：3173 / 3178
页数：5
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