Superconducting Materials Research Center;
General Research Institute for Nonferrous Metal;
Beijing 100088;
China Superconducting Materials Research Center;
General Research Institute for Nonferrous Metal;
Beijing 100088;
China National Center of Analysis and Testing for Nonferrous Metal and Electronic Materials;
Beijing 100088;
China National Center of Analysis and Testing for Nonferrous Metal and Electronic Materials;
Beijing 100088;
China Superconducting Materials Research Center;
General Research Institute for Nonferrous Metal;
Beijing 100088;
China Superconducting Materials Research Center;
General Research Institute for Nonferrous Metal;
Beijing 100088;
China;