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Influence of pinning on vortex critical velocity as a function of the magnetic field for Nb samples. (a) For sample N1 (full circles) and sample N1i (open symbols). The inset shows I-V curves at several fields. (b) For sample N2 at two different temperatures.
Influence of pinning on for sample NNA (panel a) and sample NNB (panel b). Effect of pinning on the differential resistance for several magnetic fields for sample NNB at two different temperatures (panels c and d).
Schematic view of the Al sample on top of an array of square rings, and the illustration of the two magnetic states of the rings used in experiment.
Influence of pinning on vortex critical velocity as a function of magnetic field for Al samples (solid lines are guides for the eyes).
Schematic layout of the influence of pinning on the flux flow critical velocity.
Summary of the geometry of Nb and NbN samples (w is the strip width, t is the film thickness, and L is the distance between the voltage leads).
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