1. International Center for Quantum Materials; School of Physics; Peking University; Beijing 100871 P. R. China
2. Collaborative Center for Materials Innovation; Beijing 100871 P. R. China
3. School of Physics and Engineering; Zhengzhou University; Zhengzhou 450001 P. R. China
4. High Pressure Group; National Institute for Materials Science; 1-1 Namiki; Tsukuba Ibaraki 305-0044 Japan
5. School of Physics and Electronic Engineering; Jiangsu Normal University; Xuzhou 221116 P. R. China