Abstract
Inhomogeneity of a high Tc superconducting sample is described by alternating weak andstrong regions, which are depicted by different critical temperaturesTcw andTcs, or different criticalcurrent densities jcw and jcs. Based on flux creep simulation, a step and two peaks in ac susceptibility (ACS) curves, asreported in the references, are observed. The ACS response in the two inhomogeneousmodels is analyzed through the calculated field distributions and their evolution withtemperature. The turning point, according to the dissipation peak at low temperature, isnot a critical temperature of any part of the sample, and the step in the real partχ′ is induced by the slow movement of flux lines in the strongregion. The different influence of ac magnetic field amplitudesBac andfrequencies f on ACS curves for two inhomogeneous models can be used as a practical criterion to distinguishTc inhomogeneityfrom jc inhomogeneity in sintered samples.
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