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Trapping of a magnetic flux in granular YBa2Cu3O7 − δ high-temperature superconductors under the action of an external magnetic field and transport current

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Abstract

Magnetic flux trapping (MFT) in granular YBa2Cu3O7 − δ high-temperature superconductors (HTSCs) is studied. At T = 77.36 K, the dependence of the hysteresis of the transverse magnetoresistance on transport current I and the maximum value of external magnetic field H ext is found in the measurement cycle 0 → H maxext → 0. The dependences of the parameters characterizing MFT, namely, residual magnetoresistance, field H min at which the magnetoresistance is minimal, and the magnetoresistance at H ext = H min, on I and H maxext are determined. MFT is found to occur in HTSC granules under the action of an external magnetic field exceeding the lower critical field of superconducting granules H c1A, and the transport current only weakly affects the magnitude of MFT.

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  1. Kharkov Institute of Physics and Technology, National Scientific Center, National Academy of Sciences of Ukraine, ul. Akademicheskaya 1, Kharkov, 61108, Ukraine

    T. V. Sukhareva & V. A. Finkel’

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  1. T. V. Sukhareva
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  2. V. A. Finkel’
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Correspondence to V. A. Finkel’.

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Original Russian Text © T.V. Sukhareva, V.A. Finkel’, 2010, published in Zhurnal Tekhnicheskoĭ Fiziki, 2010, Vol. 80, No. 1, pp. 68–73.

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Sukhareva, T.V., Finkel’, V.A. Trapping of a magnetic flux in granular YBa2Cu3O7 − δ high-temperature superconductors under the action of an external magnetic field and transport current. Tech. Phys. 55, 66–73 (2010). https://doi.org/10.1134/S1063784210010111

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