hkim@sogang.ac.kr

¹ Department of Physics, Sogang University, Seoul 121-742, Korea
² Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
³ Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
⁴ Materials Research Laboratory, University of Illinois, Urbana-Champaign, IL 61801, USA
⁵ Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, IL 60439, USA
⁶ Departments of Physics and Applied Physics, Yale University, New Haven, CT 06520, USA
⁷ Department of Physics, University of California San Diego, La Jolla, CA 92093, USA
⁸ LANSCE, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
⁹ Present address: Max-Planck-Institut für Metallforschung, Stuttgart, D-70569, Germany
¹⁰ Present address: Department of Physics, Indian Institute of Science, Bangalore, 560 012, India