Affiliation: | 1. Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA 2. Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan 3. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA 4. Department of Physics, Brookhaven National Laboratory, Upton, NY, 11973, USA
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