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Proximity Effect on Flux Pinning Strength in Superconducting Nb-Ti with Thin α-Ti Ribbons
Abstract It has been found by Lee et al. that the critical temperature reduces monotonically, while the critical current density first increases and is followed by a decrease, according as the diameter of superconducting multifilamentary Nb-Ti wire is decreased. This behavior is mainly caused by the proximity effect between superconducting matrix and normal α -Ti ribbons that becomes more remarkable as the thicknesses of two regions become smaller. The critical temperature and the elementary pinning strength of α -Ti ribbons are theoretically estimated by solving the phenomenological Ginzburg-Landau equations for multilayered structure with superconducting and normal layers. The critical current density is calculated from a statistic summation of the elementary pinning forces. The obtained critical temperature decreases monotonically, while the critical current density increases, with decreasing thicknesses of the two layers. The decrease in JC observed by Lee et al. is considered to result from constriction of superconducting layers by heavy cold work.
Proximity Effect on Flux Pinning Strength in Superconducting Nb-Ti with Thin α-Ti Ribbons
Abstract It has been found by Lee et al. that the critical temperature reduces monotonically, while the critical current density first increases and is followed by a decrease, according as the diameter of superconducting multifilamentary Nb-Ti wire is decreased. This behavior is mainly caused by the proximity effect between superconducting matrix and normal α -Ti ribbons that becomes more remarkable as the thicknesses of two regions become smaller. The critical temperature and the elementary pinning strength of α -Ti ribbons are theoretically estimated by solving the phenomenological Ginzburg-Landau equations for multilayered structure with superconducting and normal layers. The critical current density is calculated from a statistic summation of the elementary pinning forces. The obtained critical temperature decreases monotonically, while the critical current density increases, with decreasing thicknesses of the two layers. The decrease in JC observed by Lee et al. is considered to result from constriction of superconducting layers by heavy cold work.
Proximity Effect on Flux Pinning Strength in Superconducting Nb-Ti with Thin α-Ti Ribbons
Matsushita, Teruo (author) / Otabe, Soji (author) / Matsuno, Tetsuya (author)
1990-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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