Low-field AC susceptibility study of critical current density in Eu:123 and Bi:2223 superconductors |
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| Institution: | 1. Institute of Chemistry, FEB RAS, 159, Pr. 100-letiya Vladivostoka, Vladivostok 690022, Russia;2. Institute of Solid State Chemistry and Mechanochemistry, SB RAS, 18, Kutateladze Str., Novosibirsk 630128, Russia;1. RIKEN SPring-8 Center, 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan;2. Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan |
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| Abstract: | Low-field AC susceptibility measurements have been made, at different values of AC field amplitude Hm (26–600 A/m), on Eu:123 and Bi:2223 samples. Analysis of the temperature dependence of the AC susceptibility has been done employing Beans’ critical state model. The intergranular critical current density (Jc) is calculated as a function of both Hm and temperature for both samples, respectively. It is found that Jc increases with increasing Hm for both samples and its values are generally higher in Bi sample than in Eu sample. Our results are discussed in terms of zero-temperature pinning potential βI(0) in both systems. |
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