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J Takahashi
Department of Physics, Tokyo gakugei University
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H Endoh
Department of Physics, Tokyo gakugei University
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C Nakayama
Department of Physics, Tokyo gakugei University
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N Koshikawa
Insitute for Solid State Physics, The University of Tokyo
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I Kanazawa
Department of Physics, Tokyo gakugei University
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T Iwashita
Department of Physics, Tokyo gakugei University
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S Takeuti
Insitute for Solid State Physics, The University of Tokyo