1. Department
of Materials Science and Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan
2. The
Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, 2031 E. Paul Dirac Dr #240, Tallahassee, Florida 32310, United States
3. Department
of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan