1. Planning Division AGC Inc. Tsurumi‐ku Suehiro‐cho 1‐1 Yokohama Kanagawa 230‐0045 Japan
2. Materials Integration Laboratories AGC Inc. Yokohama Kanagawa 230‐0045 Japan
3. Department of Physics Faculty of Sciences Kyushu University Fukuoka Fukuoka 819‐0395 Japan