1. Center for Excellence in Superconducting Electronics (CENSE)State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences Shanghai 200050 P. R. China
2. College of Materials Science and Opto‐Electronic TechnologyUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 China