1. Department of Physics, Florida A&M University, Tallahassee, Florida 32307, USA
2. Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
3. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
4. Department of Materials Science and Engineering, University of Tennenssee Knoxville, Tennessee 37996, USA
5. Department of Physics and Astronomy, University of Tennenssee Knoxville, Tennessee 37996, USA