1. The Institute of Scientific and Industrial Research (ISIR), Osaka University 8–1 Mihogaoka, Ibaraki, Osaka 567-0047, JapanTel.: Fax:
2. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST) 2268–1 Shimo-shidami, Moriyama-ku, Nagoya 463-8687, Japan