1. Niigata Institute of Technology, 1719 Fujihashi, Kashiwazaki 945-1195
2. Institute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
3. Department of Physics, Faculty of Science, Niigata University, Ikarashi 2-8050, Niigata 950-2181
4. Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka, 590-0494
5. Advanced Institute of Materials Research, Moniwadai 2-6-8 Taihaku-ku, Sendai 980-0252