Compositional Phase Separation in La_<2-x>Ba_xCuO_y near the Optimum Composition for Superconductivity
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概要
- 論文の詳細を見る
Compositional phase separation was observed in La_<2-x>Ba_xCuO_y near the optimum composition (x〜0.16) for superconductivity with a decisive miscibility gap by means of X-ray diffraction measurements. The phase-separated samples do not show intrinsic superconductivity. Therefore, the superconductive compound in this system is not in a chemical equilibrium state at low temperatures, but is a high-temperature phase obtained by quenching to room temperature. The critical temperature of the phase separation T_p takes a maximum value of 950℃ at x〜0.16, suggesting that phase instability is crucial for high-T_c superconductors. The end composition of the miscibility gap in the Ba-poor composition region was found to be 0.12, which is a singular point from crystallographic and band structural standpoints.
- 社団法人日本物理学会の論文
- 1993-04-15
著者
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YOSHIMURA Kazuyoshi
Department of Chemistry, Graduate School of Science, Kyoto University
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TANAKA Hiroshi
Department of Pediatrics, Hirosaki University School of Medicine
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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Uemura Takashi
Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University
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KOSUGE Koji
Department of Chemistry, Faculty of Science, Kyoto University
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Uemura T
Kyoto Univ. Kyoto Jpn
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Kosuge Koji
Department Of Chemistry Faculty Of Science Kyoto University
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Kosuge K
Division Of Chemistry Graduate School Of Science Kyoto University
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Kosuge Koji
Department Of Chemistry Kyoto University
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Kubota Hiroshi
Department of Chemistry, Faculty of Science, Kyoto University
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Date Yumiko
Department of Chemistry, Faculty of Science, Kyoto University
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Nakanishi Makoto
Department of Chemistry, Faculty of Science, Kyoto University
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Ohmura Tomohiko
Department of Chemistry, Faculty of Science, Kyoto University
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Saga Nobuhiro
Department of Chemistry, Faculty of Science, Kyoto University
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Sawamura Takashige
Department of Chemistry, Faculty of Science, Kyoto University
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Kosuge Koji
Department Of Chemistry Faculty Of Science
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Ohmura Tomohiko
Department Of Chemistry Graduate School Of Science Kyoto University
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Uemura T
Department Of Polymer Chemistry Graduate School Of Engineering Kyoto University
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Uemura Takashi
Department Of Chemistry Faculty Of Science Kyoto University
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Saga Nobuhiro
Department Of Chemistry Faculty Of Science Kyoto University
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Uemura Takashi
Department Of Applied Biological Science Science University Of Tokyo
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Nakanishi Makoto
Department Of Applied Chemistry Faculty Of Engineering Okayama University
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Date Yumiko
Department Of Chemistry Faculty Of Science Kyoto University
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Tanaka Hiroshi
Department Of Cardiology Jichi Medical School
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Sawamura Takashige
Department Of Chemistry Faculty Of Science Kyoto University
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Kubota Hiroshi
Department Of Cardiovascular Medicine Kyushu University Graduate School Of Medical Sciences
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Kubota Hiroshi
Department Of Chemistry Faculty Of Science Kyoto University
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Kubota Hiroshi
Department Of Appl Ed Physics Sccond Faculty Of Engineering Tokyo Univ.
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Nakanishi Makoto
Department Of Chemistry Faculty Of Science Kyoto University
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Tanaka Hiroshi
Department Of Analytical Chemistry Faculty Of Pharmaceutical Sciences Hoshi University
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