1. Department of Chemistry, University of Zurich, Zürich CH-8057, Switzerland
2. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk 80-233, Poland
3. Advanced Materials Centre, Gdansk University of Technology, Gdansk 80-233, Poland
4. Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
5. Department of Physics, University of Zurich, Zürich CH-8057, Switzerland
6. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (CAS), Shanghai 200050, China
7. CAS Center for Excellence in Superconducting Electronics, Shanghai 200050, China
8. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen CH-5232, Switzerland