1. Center for High Pressure Science and Technology Advanced Research, Beijing 100094, P. R. China
2. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
3. Institute of Materials Structure Science, High Energy Accelerator, Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
4. Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
5. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
6. Spallation Neutron Source Science Center, Dongguan 523803, P. R. China
7. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
8. Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
9. Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, P. R. China
10. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China