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Two-Band Calculations on the Upper Critical Field of Sc2Fe3Si5

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Abstract

The ternary compound Sc2Fe3Si5 has attracted much attention because of the various anomalous physical properties. The specific heat experiment and energy band structure calculation suggest that Sc2Fe3Si5 is a two-gap superconductor. Based on this, we analyze the upper critical field for superconducting Sc2Fe3Si5 crystals using the two-band Ginzburg-Landau theory. A two-parameter variational approach is adopted to obtain the upper critical field in arbitrary direction. The temperature and angular dependences of the upper critical field are plotted. The results reproduce the experimental data in a very broad temperature range and strongly support previous specific heat data and theoretical calculation, pointing to the existence of two energy gaps in Sc2Fe3Si5. The anisotropy of the upper critical field is also studied and is about 2, in accordance with the experimental result. Moreover our calculations indicate that Sc2Fe3Si5 has rather a three-dimension character, in agreement with the energy band calculation.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 61501118) 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

    Minxia Liu, Yongzhao Xu, Geng Zhang & Rui Zhang

  2. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, China

    Lichun Yang

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  1. Minxia Liu
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  2. Lichun Yang
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  3. Yongzhao Xu
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  4. Geng Zhang
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  5. Rui Zhang
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Correspondence to Yongzhao Xu.

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Liu, M., Yang, L., Xu, Y. et al. Two-Band Calculations on the Upper Critical Field of Sc2Fe3Si5 . J Supercond Nov Magn 29, 2519–2522 (2016). https://doi.org/10.1007/s10948-016-3610-3

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  • DOI: https://doi.org/10.1007/s10948-016-3610-3

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