1. Laboratory for Materials and StructuresTokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan
2. Present address: Institute of Multidisciplinary Research for Advanced MaterialsTohoku University Katahira2-1-1, Aoba-ku Sendai 980-8577 Japan
3. Kanagawa Institute of Industrial Science and Technology 705-1 Shimoimaizumi Ebina 243-0435 Japan