1. Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences 1 , Hefei 230031, China
2. University of Science and Technology of China 2 , Hefei 230026, China
3. Physics Department, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University 3 , Shanghai 200444, China
4. High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences 4 , Hefei 230031, China
5. Collaborative Innovation Centre of Advanced Microstructures, Nanjing University 5 , Nanjing 210093, China