The results of studying the effect of ion irradiation (Fe2+ ions E=5.6 MeV) in the modes of creating radiation defects and implantation on the critical current of high-temperature superconducting (HTS) composites are presented. An analysis was made of both the integral critical current obtained from measurements of the total magnetization of the samples and the local critical current determined from the data of scanning Hall magnetometry. It is shown that at the same ion fluence Ф=2‧1013 cm-2, an increase in the critical current Jc is observed in the ion implantation regime, while in the regime of radiation defects, a slight drop in Jc is observed. This circumstance indicates an enhancement of pinning due to the additional magnetic interaction of Abrikosov vortices with magnetic ions implanted in the HTS layer.
This paper presents the results of studying the processes of еру HTS composites switching from the superconducting to the resistive state at microsecond current pulses. Two modes of pulsed current load were used: with an amplitude of ~ 1.1 Ic (the so-called "soft" mode) and with an amplitude of ~ 3 Ic ("hard" mode). The possibility of passing supercritical currents through the tape without superconductor characteristics degradation is shown. To explain the processes occurring in the tape during the current pulse, 2D FEA (finite element analyzes) was developed, with the help of which the dynamic resistance of the HTS composite superconducting layer was calculated in the "hard" load mode and nonstationary processes of current redistribution between the different tape layers were demonstrated.
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