Abstract
The influence of the structure of foamed polycrystalline bismuth-based superconductors on their critical currents and current-voltage characteristics is studied. It is found that superconducting foams have a fractal structure, and the fractal dimension of the boundary between the normal and superconducting phases is estimated. The magnetic and transport properties of superconducting foams are investigated, and the current-voltage characteristics are obtained in a wide range of currents. The effect of percolation phenomena on vortex pinning in a foamed superconductor is considered. The current-voltage characteristics of the superconducting foams at the beginning of the resistive transition are found to be in good agreement with a model in which a magnetic flux is assumed to be trapped in the fractal clusters of a normal phase.
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Original Russian Text © D.A. Balaev, I.L. Belozerova, D.M. Gokhfeld, L.V. Kashkina, Yu.I. Kuzmin, C.R. Michel, M.I. Petrov, S.I. Popkov, K.A. Shaikhutdinov, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 2, pp. 193–198.
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Balaev, D.A., Belozerova, I.L., Gokhfeld, D.M. et al. Current-voltage characteristics of a foamed Bi1.8Pb0.3Sr2Ca2Cu3O x high-temperature superconductor with fractal cluster structure. Phys. Solid State 48, 207–212 (2006). https://doi.org/10.1134/S1063783406020016
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DOI: https://doi.org/10.1134/S1063783406020016