1. Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
2. Superconductivity and New Energy Center (SNEC), Southwest Jiaotong University, Chengdu, Sichuan 610031, China
3. School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia
4. College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China