Bismuth Valence Studies of As-Grown Superconducting Bi-Sr-Ca-Cu-O Thin Films with T_<c(zero)> from 98 K to 66 K
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概要
- 論文の詳細を見る
Bismuth valence of Bi-Sr-Ca-Cu-O superconducting film has been studied by X-ray photoemission spectroscopy. As-grown highly oriented Bi-Sr-Ca-Cu-O 2223 single-phase films with various critical temperatures from 98 K to 66 K were prepared by changing the Bi content. The Bi 4f core level electron spectra are decomposed into two components. These components are assigned to BiO and to Bi_2O_3 which is located at an energy higher than the peak of BiO by about 1 eV. Then it was empirically determined that the critical temperature can be controlled by the Bi mean valence, and changes irrespective of the number of Cu-O planes. The critical temperature of the film increases with a decrease in the Bi mean valence which was calculated from the ratio of BiO/Bi_2O_3.
- 社団法人応用物理学会の論文
- 1992-07-15
著者
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TAKAI Yoshiaki
Department of Electronics Engineering, Nagoya University
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HAYAKAWA Hisao
Department of Electronics Engineering, Nagoya University
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YOSHIDA Kenji
Department of Electronic Information Systems, Shibaura Institute of Technology
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Ohbayashi K
Hiroshima Univ. Hiroshima
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Takai Yoshiaki
Nagoya University
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Anma Masatoshi
Department Of Electronics Faculty Of Engineering Nagoya University
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Hayakawa H
Nagoya Univ. Nagoya Jpn
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OHBAYASHI Kazushige
Research and Development Center, NGK Spark Plug Co., Ltd.
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Yoshida Kenji
Department Of Electronics Faculty Of Engineering Nagoya University
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Yoshida Kenji
Department Of Chemistry Faculty Of Science Ehime University
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Yoshida Kenji
Department of Biochemistry, Kinki University School of Medicine
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Takai Yoshiaki
Department of Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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