1. Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
2. Core Facility Center, Osaka University, Toyonaka, Osaka 560-0043, Japan
3. Center for Advanced High Magnetic Field Science (AHMF), Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
4. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan