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A model is proposed to describe the effect of surface barrier (SB) on ac susceptibility (ACS) and a different kind of dip effect (DE) in ACS is observed. Simulation based on this model with flux creep reveals two dips in ACS curve, one at temperature Tj in real part Χ' and the other at temperature T" d in imaginary part Χ". These two dips are different from the ones resulting from the peak effect in critical current density j c , where the dips in Χ' and Χ" occur at the same temperature T p . The DE is also characterized by a large Χ" and a large ‖Χ'(T'd)‖. The ACS curves for single crystals Bi 2 Sr 2 CaCu 2 O 8 have been observed and compared with the DE in YBa 2 Cu 3 O 7 samples, confirming the numerical results. It is also shown that when flux creep is absent only kinks appear in Χ' and Χ" for a sample with SB.

Dip effect in ac susceptibility due to surface barrier with flux creep