Reference : Dynamic regimes in films with a periodic array of antidots
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Dynamic regimes in films with a periodic array of antidots
Silhanek, Alejandro mailto [Katholieke Universiteit Leuven - KUL > > > >]
Raedts, S. [> > > >]
Van Bael, M. J. [> > > >]
Moshchalkov, V. V. [ > > ]
European Physical Journal B -- Condensed Matter
Springer Science & Business Media B.V.
Yes (verified by ORBi)
New York
[en] superconductivity
[en] 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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