Nonlocal vortex motion in mesoscopic amorphous Nb0.7Ge0.3 structures
A. Helzel, I. Kokanovic, D. Babic, L. V. Litvin, F. Rohlfing, F. Otto, C. Surgers, C. Strunk
Abstract
We study nonlocal vortex transport in mesoscopic amorphous Nb0.7Ge0.3 samples. A dc current I is passed through a wire connected via a perpendicular channel, of a length L= 2-5 um, with a pair of voltage probes where a nonlocal response Vnl ~ I is measured. The maximum of Rnl=Vnl/I for a given temperature occurs at an L-independent magnetic field and is proportional to 1/L. The results are interpreted in terms of the dissipative vortex motion along the channel driven by a remote current, and can be understood in terms of a simple model.
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