Field and geometry dependence of the ac loss in the critical-state model of type-II superconductors
M. Forsthuber, G. Hilscher
DOI 10.1103/PhysRevB.45.7996 · Physical Review B
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Abstract
The imaginary part of the ac susceptibility χ’’ is studied as a function of varying ac field amplitude and cross-section geometry in the framework of the critical-state model. We present a formalism which allows a straightforward calculation of the position of the maximum of χ’’(T,H). Numerical results demonstrate that, under the assumption of a general power law for the field dependence of jc, the so-called peak field deviates significantly from the penetration field for the diverse sample cross sections. Consequently the maximum of χ’’(T,H) cannot be considered as an intrinsic property without correcting for the cross section.
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