Abstract
A significant overestimation of the critical current densityJc is foundfor a measuring method of induced third harmonic voltage for thin superconductors of thickness lessthan 1 µm. This is speculated to be caused by a reversible motion of flux lines in a pinningpotential which reduces the nonlinear properties such as AC losses or the thirdharmonic voltage. It is known that the effect of reversible flux motion is prominentfor superconductors with a thickness comparable to or smaller than the pinningcorrelation length of the order of a sub-micrometre, the so-called Campbell’s ACpenetration depth. In this paper the effect of reversible flux motion on the estimation ofJc by this method is preliminarily investigated by using a simplified Campbell’s model for theforce–displacement characteristics of flux lines.
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