1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4. ALBA Synchrotron Light Source, Cerdanyola del Vall′es, Barcelona E-08290, Spain
5. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
6. Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette Cedex 91192, France
7. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France
8. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China