1. Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
2. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
3. Vytautas Magnus University, K. Donelaičio Str. 58, Kaunas 44248, Lithuania
4. Department of Physics, Kunsan National University, Gunsan 54150, Korea