Abstract
Two peaks appear in the temperature and field dependences of the imaginary part of the fundamental AC-susceptibility, measured in a low superposed DC- and AC-field. The first low field peak appears when the AC-field superposed on the DC-field reaches the middle of the sample. The second peak is related to the magnetization loop symmetry loss caused by the strong field dependent intergrain critical current density in the presence of the DC-field. The quantitative analysis of the two-peak effect in terms of the extended critical state model has been presented. The calculated data well fit the measured data for a ceramic sample YBa 2Cu 3O 7−δ given by S. Gjolmesli and K. Fossheim in Ref. [1].
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