1. Cryogenics Support Division, Core Facility Center, Osaka University, Toyonaka, Osaka 560-0043, Japan
2. Central Institute of Radioisotope Science and Safety, Kyushu University, Fukuoka 819-0395, Japan
3. Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
4. Advanced Science Research Center, JAEA, Tokai, Ibaraki 319-1195, Japan
5. Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
6. Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
7. RIKEN, Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
8. Graduate School of Science, Kobe University, Kobe 657-8501, Japan
9. Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan