1. Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, Beijing 100190, China
2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. Department of Physics and TcSUH, University of Houston, Houston, Texas 77204, United States
5. College of Physical Science Technology, Central China Normal University, Wuhan 430079, China