Nonlocal vortex motion in mesoscopic amorphous Nb0.7Ge0.3 structures

TL;DR

This study investigates nonlocal vortex transport in mesoscopic amorphous Nb0.7Ge0.3 structures, revealing a length-independent magnetic field maximum and a 1/L proportionality in nonlocal resistance, interpreted through vortex dynamics models.

Contribution

It demonstrates nonlocal vortex motion in amorphous NbGe structures and provides a simple model explaining the observed transport phenomena.

Findings

Nonlocal resistance peaks at a magnetic field independent of channel length.

Nonlocal resistance scales inversely with channel length (1/L).

Vortex motion along the channel is driven by remote current, consistent with the model.

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.