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Hiroshi Iwasaki
The Research Institute for Iron, Stee and Other Metals, Tohoku University
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Kazuo Kamigaki
The Research Institute for Iron, Stee and Other Metals, Tohoku University
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Shiro Ogawa
The Research Institute for Iron, Stee and Other Metals, Tohoku University
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Osamu Terasaki
Physics Department, Faculty of Science, Tohoku University
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Denjiro Watanabe
Physics Department, Faculty of Science, Tohoku University