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Takashi Akima
Department of Physics, Kyoto University, Kyoto 606–8502
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Shuji NishiZaki
Department of Physics, Kyoto University, Kyoto 606–8502
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Yoshiteru Maeno
Department of Physics, Kyoto University, Kyoto 606–8502 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332–0012