1. Division
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
2. Department
of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka, Nagaoka, Niigata 940-2188, Japan
3. National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States