1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin China
2. School of Materials Science and Engineering Hebei University of Technology Tianjin China
3. College of Physics and Electronic Engineering Chongqing Normal University Chongqing China
4. School of Physical Science and Technology Southwest University Chongqing China
5. Institute for Superconducting and Electronic Materials (ISEM) University of Wollongong Wollongong Australia