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O. Nashima
Dept. Appl. Phys., Tohoku Gakuin Univ.
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T. Suzuki
Dept. Appl. Phys., Tohoku Gakuin Univ.
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K. Kamishima
Institute for Solid State Physics, Univ. of Tokyo
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T. Goto
Institute for Solid State Physics, Univ. of Tokyo
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H. Ido
Dept. Appl. Phys., Tohoku Gakuin Univ.