1. Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
4. Department of Physics, Florida State University, Tallahassee, Florida 32306-3016, USA
5. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310-3706, USA
6. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA