Numerical analysis shows harmonic susceptibilities vary with field frequency in YBCO, indicating important magnetic properties.
We present a numerical analysis of the diffusion equation of the magnetic flux in YBCO in presence of ac magnetic fields taking into account flux creep and flux flow. Despite critical state models, the results show the dependence of harmonic susceptibilities on the field frequency in agreement with the experimental behavior.
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F. et al. (1997) studied this question.
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