Critical Current Density and Flux Creep in Melt-Processed Bi-Pb-Sr-Ca-Cu-O Superconductors
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概要
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We investigated the critical current density and the flux creep in melt-processed Bi-Pb-Sr-Ca-Cu-O for the purpose of studying the existence of strong flux pinning forces due to normal conducting precipitates. We fabricated samples with a similar microstructure to melt-processed Y-Ba-Cu-O and Tl-Sr-Ca-Cu-O having a strong pinning force. When the matrix was (Bi, Pb)_2Sr_2Ca_1Cu_2O_y (2212) phase, the irreversibility field B_<irr> was expressed as B_<irr>∝(1-T/T_c)^<3/2>, which suggested that the expected flux pinning was due to normal conducting precipitates. A part of the matrix was transformed to (2223) phase by the postannealing of the sample; however, the superconducting properties were inferior to those observed in (2223) polycrystals.
- 社団法人応用物理学会の論文
- 1992-09-15
著者
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Uchikawa Fusaoki
Materials & Electronic Devices Laboratory, Mitsubishi Electric Corp.
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Umemura T
Mitsubishi Electric Corp. Kanagawa Jpn
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UMEMURA Toshio
Materials & Electronic Devices Laboratory, Mitsubishi Electric Corporation
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EGAWA Kunihiko
Materials & Electronic Devices Laboratory, Mitsubishi Electric Corporation
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Egawa Kunihiko
Materials & Electronic Devices Laboratory Mitsubishi Electric Corp.
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Uchikawa F
Advanced Technology R&d Center Mitsubishi Electric Corporation
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Uchikawa Fusaoki
Advanced Technology R&d Center Mitsubishi Electric Corp.
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NOZAKI Ayumi
Material & Electronic Devices Laboratory, Mitsubishi Electric Corpolation
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Nozaki A
Mitsubishi Electric Corp. Kanagawa Jpn
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Sato Ken
Materials & Electronic Devices Laboratory Mitsubishi Electric Corporation
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