Abstract
The complex ac susceptibility ( χ n = χ ′ n −i χ ′′ n ) measurements were performed on a (Bi,Pb) 2Sr 2Ca 2Cu 3O y silver-sheathed tape to study the vortex dynamics in a time window of 10 −4–10 −2 s . The fundamental ac susceptibility of the tape as a function of temperature, ac field amplitudes and frequencies were obtained. The current dependent activation energy was derived as U( j)∝ j −0.42, characteristic of the vortex glass/collective pinning model. By using such U( j) relation, higher harmonic susceptibilities χ n ( n=2–7) were obtained based on the numerical resolution of the flux diffusion equation. We found that theoretical results agree well with experimental data.
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