1. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences 1 , No. 239 Zhangheng Road, Shanghai 201204, China
2. The Key Laboratory of Material Physics of Ministry of Education, Zhengzhou University 2 , Zhengzhou 450052, China
3. Center for High Pressure Science and Technology Advanced Research 3 , Shanghai 201203, China
4. Institute of High Energy Physics, Chinese Academy of Sciences 4 , Beijing 100049, China