1. Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
2. Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
3. Low Temperature Center, Osaka University, Toyonaka, Osaka 560-0043, Japan
4. Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
5. Department of Engineering and Applied Sciences, Sophia University, Chiyoda, Tokyo 102-8554, Japan
6. Department of Mathematics and Physics, Hirosaki University, Hirosaki, Aomori 036-8561, Japan