Abstract
Abstract In this paper a novel method to measure the critical current density of superconductor bulks through a small point contact to the surface of the samples has been presented. Based on the proposed method a localized current is applied to the superconductor at the center of its surface in the absence of magnetic field where there is a second ring shape electrode in the outer area of the surface of the superconductor bulk. By increasing the pulse current through the central electrode beyond the critical current density of the material, normal zones develop in the superconductor. Theoretical results anticipate semi oblate spheroid normal zones as also confirmed by the obtained experimental data. Based on the used theoretical model, the form of the voltage-current relation is obtained as also verified by the measurements. Considering the area of the central electrode and the voltage current relation, a model is proposed to obtain critical current density of the bulk material, while the used electrical approach and technique avoid heat generation in the sample.
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