Abstract
We study the response of a mesoscopic superconducting square with 2×2 artificial pinning centers (antidots) to perpendicular magnetic field. In the sample, two current-biased tunnel junctions are placed near adjacent antidots. The junction voltages are measured as a function of the magnetic field (multiple small tunnel junction technique). From the magnitude of the voltage jumps which correspond to the vortex penetration (expulsion), we determine the position of the penetrating (expelled) vortex in increasing (decreasing) magnetic field. We find that the order of the vortex penetration is the same as that of vortex expulsion. We also discuss the stability of the vortex states in a square with antidots in comparison with that of a square without antidots.
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