Abstract
The hysteretic behavior of the magnetoresistance R(H) of granular high-temperature superconductors (HTSCs) of the Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and La-Sr-Cu-O classical systems is investigated for transport current densities lower and higher than the critical density (at H = 0). All systems exhibit universal behavior of the width of the magnetoresistance hysteresis loop: independence of transport current under identical external conditions. This means that flux trapping in HTSC grains is the main mechanism controlling the hysteretic behavior of the magnetoresistance of granular HTSCs, while pinning of Josephson vortices in the intragranular medium makes no appreciable contribution to the formation of magnetoresistance hysteresis (when transport current flows through the sample). Experimental data on relaxation of residual resistance after the action of a magnetic field also confirm this conclusion.
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Original Russian Text © D.A. Balaev, A.A. Dubrovskiĭ, K.A. Shaikhutdinov, S.I. Popkov, D.M. Gokhfeld, Yu.S. Gokhfeld, M.I. Petrov, 2009, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 135, No. 2, pp. 271–279.
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Balaev, D.A., Dubrovskiĭ, A.A., Shaikhutdinov, K.A. et al. Mechanism of the hysteretic behavior of the magnetoresistance of granular HTSCs: The universal nature of the width of the magnetoresistance hysteresis loop. J. Exp. Theor. Phys. 108, 241–248 (2009). https://doi.org/10.1134/S106377610902006X
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DOI: https://doi.org/10.1134/S106377610902006X