journal article·2020-02-19

Carbon-Coating Layers on Boron Generated High Critical Current Density in MgB2 Superconductor

Haobo Liu, Jiancheng Li, Mingjie Sun, Jiangtao Qu, Rongkun Zheng, Julie M. Cairney, Mingyuan Zhu, Ying Li, Wenxian Li

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Abstract

Boron particles with a homogeneous carbon-coating layer were employed as the precursor to fabricate MgB 2 superconductors to generate artificial two-dimensional (2D) flux-pinning centers. Systematic microstructure investigation reveals that the carbon layers are well-distributed in the MgB 2 matrix without agglomeration. The thickness of the carbon layers is smaller than the MgB 2 coherent length, which makes them transparent to supercurrent. The critical current density is increased because of the strong flux-pinning effects of the 2D carbon layers in the superconductor as highly efficient flux-pinning centers and the increased irreversibility field due to the carbon-doping effects.
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OpenAlex topics: Educational Research and Pedagogy

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Affiliations

Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

School of Physics, the University of Sydney, Sydney, New South Wales 2006, Australia

Institute for Sustainable Energy, Shanghai University, Shanghai 200444, China

Shanghai Key Laboratory of High Temperature Superconductors, Shanghai 200444, China

Funding

Shanghai Municipal Education Commission · National Natural Science Foundation of China · Shanghai Key Laboratory of High Temperature Superconductors, Research Center for Superconductors and Applied Technologies, Shanghai University

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