Affiliation: | (1) Department of Physics, Faculty of Science, Kanazawa University, Kanazawa, 920-1192, Japan;(2) Present address: Nissin Electric Co. ltd, Ukyou-ku Kyoto, 615;(3) Present address: Toshiba Corporation, Ootawara Tochigi, 324;(4) Department of Physics, Faculty of Science, Saitama University, Saitama, 338 |