engleski

Reversal of Nonlocal Vortex Motion in the Regime of Strong Nonequilibrium

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 µ ; ; ; m, with a pair of voltage probes where a nonlocal response VnlI 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.

low-Tc films; mesoscopic and nanoscale systems; Vortex lattices; flux pinning; flux creep

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