Regime of vortex flow in short Nb variable-thickness bridges

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Abstract
In the characteristics of short (l ? 0.2 μm) variable-thickness bridges made of Nb films we have found a transition into a regime of vortex flow when the thickness of the weak-coupling region is varied. The vortex flow is favored below a thickness of the order of the size of Nb grains. It is confirmed that the weak-coupling region exceeds the size of the vortex core because of the decrease in coherence length. A linear variation of the critical current with temperature and a linear or quadratic voltage increase in the I-V characteristic are observed in the vortex flow regime in agreement with theory. However, some disagreement is found in the microwave response.

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