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. Helmholtz-Zentrum Berlin fur Materialien und Energie, Albert-Einstein-Str..15, 12489 Berlin, Germany
5. Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91192 Gif-sur-Yvette Cedex, France
6. ALBA Synchrotron Light Source, Cerdanyola del Valles, 08290 Barcelona, Spain
7. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
8. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China