1. The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
2. Anhui Key Laboratory of Optoelectric Materials Science and Technology, Department of Physics, Anhui Normal University, Wuhu, Anhui 241000, P. R. China
3. Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
4. Siberian Federal University, Krasnoyarsk 660041, Russia
5. Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
6. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan