Lei Zhang、Haitao Zhang、Xiang Chu、Fangyan Liu、Chunsheng Guo、Weiqing Yang
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Key Laboratory of Advanced Technologies of Materials(Ministry of Education),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China
School of Physic Science&Technology,Superconductivity and New Energy R&D Center,Southwest Jiaotong University,Chengdu Sichuan 610031,China
State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China
LZ,H.Z contributed equally to this work The research is supported by the National Natural Science Foundation of ChinaSpecial Fund-ing of China Postdoctoral Science FoundationSichuan Science and Technology Program