1. Department of Materials Science and Engineering, Kyushu University
2. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
3. Graduate Student, Kyushu University
4. Department of Materials Science and Engineering, Tokyo Institute of Technology
5. Research Center for Steel, Kyushu University
6. Cryogenics Division, Research Facility Center, University of Tsukuba