Study of current–voltage characteristics of Bi-based high-temperature superconductors with fractal cluster structure

We study the effect of the structure on critical currents and current–voltage characteristics (CVC’s) of foamed bismuth-based polycrystalline high-temperature superconductors (HTSC). The fractal cluster structure of superconducting foams has been observed and the fractal dimension of boundaries betw...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2006-03, Vol.435 (1-2), p.19-22
Main Authors: Shaykhutdinov, K.A., Balaev, D.A., Gokhfeld, D.M., Kuzmin, Yu.I., Popkov, S.I., Petrov, M.I.
Format: Article
Language:English
Subjects:
Cluster
Critical current density
Fractal
Percolation
Pinning
Superconducting foam
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Summary:We study the effect of the structure on critical currents and current–voltage characteristics (CVC’s) of foamed bismuth-based polycrystalline high-temperature superconductors (HTSC). The fractal cluster structure of superconducting foams has been observed and the fractal dimension of boundaries between superconducting and normal clusters has been determined. Based on the magnetic and transport properties of the foamed polycrystalline superconductors, we have shown that the initial parts of CVC’s of the superconducting foams are described well by the model that accounts the magnetic flux trapping in fractal clusters of a normal phase.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2006.01.010