1. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
2. School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China
3. Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40 01187 Dresden Germany
4. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
5. Helmholtz‐Zentrum Berlin fur Materialien und Energie Albert‐Einstein‐Str.15 12489 Berlin Germany
6. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan
7. Deutsches Elektronen‐Synchrotron DESY Notkestraße 85 22607 Hamburg Germany