Affiliation: | 1. Graduate School of Science, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan 2. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), Chuou-ku, Tokyo, 113-0027, Japan 3. Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan
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