1. Institute for Solid State Physics, University of Tokyo
Roppongi,
Minato-ku, Tokyo 106-8666
2. Faculty of Engineering, Tohoku Gakuin University,
Tagajo 985-8537
3. Institute for Materials Research, Tohoku University,
Katahira,
Aoba-ku, Sendai 980-8577
4. Faculty of Science, Himeji Institute of Technology
Kamigori,
Ako-gun, Hyogo 678-1297