1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
2. School of Physics, Nanjing University, Nanjing 210093, China
3. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei University of Technology, Hefei 230009, China
4. Engineering Research Center of High-Performance Copper Alloy Materials and Processing, Ministry of Education, Hefei University of Technology, Hefei, 230009, China