Abstract
The dissipation mechanism in high-T csuperconducting ceramics was studied by analyzing the magnetic field dependence of the transport critical current and the form of the current-voltage characteristics. It was found that the actual magnetic field dependence of the transport critical current is significantly slower than that predicted by the weak-link-quenching model. The low-voltage-level current-voltage characteristics were described in terms of thermally activated flux creep at grain boundaries, taking into account collective pinning of intergranular Josephson vortices. For the investigated samples, a low-field, high-temperature mean pinning energy barrier of a few tens of meV was determined.
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Miu, L., Popa, S., Crisan, A. et al. Dissipation in current-carrying high-T c superconducting ceramics in applied magnetic field. J Supercond 6, 279–284 (1993). https://doi.org/10.1007/BF00626270
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DOI: https://doi.org/10.1007/BF00626270