Institution: | 1. Department of Physics, Kyushu University, Hakozaki, Hugashi-ku, Fukuoka, 812-8581, Japan 2. RCNP, Osaka University, Ibaraki, Osaka, 567-0047, Japan 3. Department of Applied Physics, Miyazaki University, Miyazaki, 889-2192, Japan 4. Department of Physics, Kyushu Institute of Technology, Kitakyushu, 804-8550, Japan
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