Abstract
Contactless Estimation of Critical Current Density and Its Temperature Dependence Using Magnetic Measurements A. Youssef, L. Banicova, Z. Svindrych and Z. Janůb,∗ Charles University in Prague, Faculty of Mathematics and Physics, 121 16 Prague 2, Czech Republic Institute of Physics of the AS CR, v.v.i., Na Slovance 2, 182 21 Prague, Czech Republic We have measured magnetic response of second-generation high temperature superconductor YBa2Cu3Ox wire and Nb thin film in perpendicular ac field as a function of temperature. We compare experimental complex ac susceptibility to the calculated susceptibility based on the model of Bean’s critical-state response in two-dimensional disk in perpendicular field. The harmonic analysis is needed for comparison between the model and the experimental data. We present a method of linking model and experimental susceptibility. Good agreement of experimental susceptibility with model susceptibility of 2D disk allows contactless estimation of critical depinning current density and its temperature dependence.
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