1. Geophysical
Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
2. Department
of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
3. School
of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
4. State
Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
5. State
Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China