1. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
2. Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, Alabama 35487, United States
3. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
4. Department of Material Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
5. Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
6. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States