Abstract
Vortex pinning effects by artificial antidots have been studied in superconducting 2 x 2 antidot clusters of W 1-x Ge x (x∼0.33) and Pb/Cu. These effects have been observed as several minima appearing in the magnetoresistance close to the transition temperature in magnetic fields between 0 and 100 G. Vortex configurations with one and two flux quanta per antidot and their related half-filling configurations have been found showing that different well controlled stable vortex configurations can be realised by tuning the magnetic field.
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