1. Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Innovation Campus North Wollongong New South Wales 2500 Australia
2. Center of Materials Physics and Chemistry, and Department of Physics Beihang University Beijing 100191 P. R. China
3. BUAA‐UOW Joint Research Centre Beihang University Beijing 100191 P. R. China