1. Department of Chemistry, Biochemistry & Physics, Eastern Washington University, Cheney, Washington 99004, United States
2. Department of Physics, University of Warwick, Coventry CV4 7AL, U.K.
3. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
4. Department of Physics & Astronomy, University College London, London WC1E 6BT, U.K.
5. Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, U.K.
6. National High Magnetic Field Laboratory, Pulsed-Field Facility, MS-E536, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States