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, China
2. Laboratory
of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk 660036, Russia
3. Department
of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
4. Beijing
National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
5. Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States