1. Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan
2. Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
3. Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University, Akita 010-8502, Japan
4. High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
5. Center for Low Temperature Science, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
6. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan