Abstract
This study aims at establishing the interrelation between the current-carrying capacity and peculiarities of magnetoresistance of granular YBa2Cu3O7 − δ HTSCs (T c = 92.5 K). The transverse magnetoresistance of several batches of YBa2Cu3O7 − δ HTSC samples with noticeably different values of critical supercurrent density j c is measured in magnetic fields H ext up to H maxext ≈ 500 Oe in a wide range of transport currents (5 mA ≤ I ≤ 1600 mA) at T = 77.4 K. Samples with relatively high values of j c (H ext = 0) ≥ 100 A/cm2 do not exhibit any anomalies in their field dependences. Magnetoresistance jumps δρBG-VG/ρ273K are observed for samples with low values of j c ≥ 20 A/cm2 in fields H BG-VG ≈ 200–260 Oe. The width ΔH BG-VG of the anomalous resistance region increases upon an increase in I. The magnetoresistance jumps decrease with increasing I in increasing field H ext(0 → H maxext ) and increase in decreasing field H ext(H maxext → 0). It is found that these peculiarities of the field dependences of magnetoresistance are associated with a first-order phase transition (in magnetic field) in the vortex structure of YBa2Cu3O7 − δ HTSCs of the Bragg glass-vortex glass type.
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Original Russian Text © T.V. Sukhareva, V.A. Finkel, 2008, published in Zhurnal Éksperimental’noĭi Teoreticheskoĭ Fiziki, 2008, Vol. 134, No. 5, pp. 922–929.
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Sukhareva, T.V., Finkel, V.A. Phase transition in the vortex structure of granular YBa2Cu3O7 − δ HTSCs in weak magnetic fields. J. Exp. Theor. Phys. 107, 787–793 (2008). https://doi.org/10.1134/S1063776108110083
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DOI: https://doi.org/10.1134/S1063776108110083