Affiliation: | 1. Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo 3-9-1, Fukui, 910-8507, Japan 2. Cryogenic Laboratory, Faculty of Engineering, Fukui University, Bunkyo 3-9-1, Fukui, 910-8507, Japan 3. Department of Physics, General Education, Kagawa Medical University, Ikenobe 1750-1, Miki-cho, Kita-gun, Kagawa-ken, 761-0793, Japan 4. School of Physics, University of Sydney, NSW, 2006, Australia
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