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Two-Band Calculations on the Superconducting Property of SrPt\(_{2}\mathrm{As}_{2}\)

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Abstract

Recently, electronic specific heat experiments suggest that SrPt\(_{2}\mathrm{As}_{2}\) has two superconducting energy gaps. We have therefore investigated the temperature and angular dependence of the upper critical field and the critical velocity of Cooper pairs for superconductor SrPt\(_{2}\mathrm{As}_{2}\) based on the two-band Ginzburg–Landau theory. The theoretical result for the temperature dependence of the upper critical field fits the experimental data very well over a broad temperature range. Contrary to the two-band superconductor Lu\(_{2}\mathrm{Fe}_{3}\mathrm{Si}_{5}\), both the upper critical field and the reduced critical velocity of Cooper pairs increase as the angle increases.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 61501118), the Natural Science Foundation of Guangdong Province, China (Grant No. 2014A030310262), and the Training Plan of Guangdong Province for Outstanding Young Teachers in University.

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Authors and Affiliations

  1. School of Electronic Engineering, Dongguan University of Technology, Dongguan, 523808, China

    Min-Xia Liu, Yong-Zhao Xu, Geng Zhang, Hai Ye & Xiao-Yuan Huang

  2. Department of Applied Foreign Languages, Dongguan Polytechnic, Dongguan, 523808, China

    Wen-Qi Guo

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  1. Min-Xia Liu
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  3. Yong-Zhao Xu
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Correspondence to Yong-Zhao Xu.

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Liu, MX., Guo, WQ., Xu, YZ. et al. Two-Band Calculations on the Superconducting Property of SrPt\(_{2}\mathrm{As}_{2}\) . J Low Temp Phys 183, 379–386 (2016). https://doi.org/10.1007/s10909-016-1555-3

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