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Effect of minor graphene doping on the microstructure and superconductivity of FeSe

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Abstract

The polycrystalline FeSe bulks were sintered by solid-state reaction using a two-step sintering process to investigate the effect of graphene addition on the superconductivity and microstructure of the FeSe bulks. With the increase of graphene doping, the thickness of tetragonal β-FeSe sheet decreased obviously due to the existence of graphene between the layers. The grain connectivity of FeSe superconductor is significantly improved, and the critical transition temperature (Tc) is apparently enhanced up to 10.57 K in Fe1.01SeG0.05, which increased by 15.3% compared to the Fe1.01Se bulk without doping graphene. The critical current density (Jc) of Fe1.01SeG0.05 reaches 5 × 103 A/cm2 under zero magnetic field. Moreover, the critical current density (Jc) of Fe1.01SeG0.05 is simultaneously increased under high magnetic field due to the refined grains by graphene doping.

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Acknowledgements

This work was supported by the National Natural Sciences Foundation of China under (Grant No. 51975411), Natural Science Foundation of Tianjin (Grant No. 16JCQNJC02300), Natural Science Foundation of Tianjin (Grant No. 18JCYBJC88500). Meanwhile, The Personnel Training Plan for Young and Middle-Aged Innovation Talents in Universities in Tianjin of China and the National Natural Science Foundation of China (Grant No. 51402213) are also acknowledged.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Mechanical Engineering, College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, 300222, China

    Chuangchuang Gong, Qian Zhao, Xuecheng Ping, Pan Zhang, Yishan Liu & Liang Hao

  2. Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment, Tianjin, 300222, China

    Qian Zhao & Liang Hao

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  1. Chuangchuang Gong
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Correspondence to Qian Zhao or Xuecheng Ping.

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Gong, C., Zhao, Q., Ping, X. et al. Effect of minor graphene doping on the microstructure and superconductivity of FeSe. J Mater Sci: Mater Electron 31, 15336–15344 (2020). https://doi.org/10.1007/s10854-020-04097-w

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