1. Department of Physics, Graduate School of Science, Osaka University, Machikaneyama 1-16, Toyonaka, Osaka 560-0043
2. Department of Material Physics, Osaka National Research Institute, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577
3. College of Pharmacy, Nihon University Funabashi, Chiba 274-8555