1. Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Rd., Pudong, Shanghai 201203, People's Republic of China
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW 2500, Australia
4. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, People's Republic of China
5. Shanghai Synchrotron Radiation Facility (SSRF), 239 Zhangheng Road, Pudong New District, Shanghai 201204, People's Republic of China
6. Photon Sciences Directorate, Brookhaven National Laboratory, Building 745, P.O. Box 5000, Upton, New York 11973-5000, USA
7. Geophysical Laboratory, Carnegie Institution of Washington, Washington, District of Columbia 20015, USA