1. Beijing Frontier Research Center on Clean Energy, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
5. Spallation Neutron Source Science Centre, Dongguan 523803, China