| Title: |
Upward curvature of the upper critical field and the V-shaped pressure dependence of $T_c$ in the noncentrosymmetric superconductor PbTaSe$_2$ |
| Authors: |
Wang, J. R., Xu, Xiaofeng, Zhou, N., Li, L., Cao, X. Z., Yang, J. H., Li, Y. K., Cao, C., Dai, Jianhui, Zhang, J. L., Shi, Z. X., Chen, B., Yang, Zhihua |
| Source: |
J Supercond Nov Magn 28, 3173 (2015) |
| Publication Year: |
2015 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| More Details: |
The temperature evolution of the upper critical field $H_{c2}(T)$ in the noncentrosymmetric superconductor PbTaSe$_2$ 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$\leq$$T$$\leq$350K 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$$\sim$5-10 kbar but then rising with further pressurization. The underlying physical mechanisms of all these findings have been discussed.
Comment: 12 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1007/s10948-015-3177-4 |
| Access URL: |
http://arxiv.org/abs/1505.02232 |
| Accession Number: |
edsarx.1505.02232 |
| Database: |
arXiv |
