Affiliation: | 1. Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science , Osaka University , 1-3 Machikaneyama-cho, Toyonaka , 560-8531 , Japan Fax: E-mail: suzuki@mp.es.osaka-u.ac.jp;2. Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science , Osaka University , 1-3 Machikaneyama-cho, Toyonaka , 560-8531 , Japan |