Abstract
The inductive method for measuring the critical current density j C in a high-temperature superconductor (HTS) has been investigated numerically. In the method, a HTS sample is exposed to the inhomogeneous ac magnetic field which is generated by a small coil placed just above the sample. While applying an ac current I( t) = I 0 sin 2 πft in the coil, the third-harmonic voltage V 3 sin(6 πft + θ 3) induced in the coil is measured. In order to simulate the inductive method, I 0– V 3 curves are numerically determined and j C is estimated from their characteristics. The results of computations show that, for a HTS bulk, the accuracy of the inductive method is not at all influenced by the cross-sectional shape of the coil. In addition, it is found that, for double-sided HTS films on an MgO substrate, the accuracy of the inductive method is strongly affected by the thickness of the substrate.
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