1. Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
2. Laboratory for High Performance Ceramics, Empa, Überlandstrasse 129, CH-8600, Dübendorf, Switzerland
3. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (CAS), Shanghai, 200050, China
4. CAS Center for Excellence in Superconducting Electronics, Shanghai, 200050, China