1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
2. Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
3. Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, United States
4. Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
5. Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech Republic
6. Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
7. School of Physical Sciences, Dublin City University, Dublin 9, Ireland
8. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui 230031, China