Dynamic Regimes in Films with a Periodic Array of Antidots

Details Dynamic Regimes in Films with a Periodic Array of Antidots Dynamic Regimes in Films with a Periodic Array of Antidots

2004-02-11

arxiv.org/abs/cond-mat/0402299v1

Eur. Phys. J. B 37, 19-24 (2004)

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures

Scientific paper

We have studied the dynamic response of Pb thin films with a square array of antidots by means of ac susceptibility chi(T,H) measurements. At low enough ac drive amplitudes h, vortices moving inside the pinning potential give rise to a frequency- and h-independent response together with a scarce dissipation. For higher amplitudes, the average distance travelled by vortices surpasses the pinning range and a critical state develops. We found that the boundary h*(H,T) between these regimes smoothly decreases as T increases whereas a step-like behavior is observed as a function of field. We demonstrate that these steps in h*(H) arise from sharp changes in the pinning strength corresponding to different vortex configurations. For a wide set of data at several fields and temperatures in the critical state regime, we show that the scaling laws based on the simple Bean model are satisfied.

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