1. Center for High-Pressure Science & Technology Advanced Research, Beijing 100094, P.R. China
2. Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
3. Department of Physics, University of North Georgia, Dahlonega, Georgia 30533, United States
4. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
5. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China
6. Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, United States