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- W147131800 abstract "Amorphous Nb0.7Ge0.3, a high-kappa type-II superconductor with very low pinning, allows for measurements in the flux-flow regime over large parts of the B-T-phase diagram. When a transport current is driven through a narrow wire (width 250 nm) connected to remote voltage probes via a perpendicular channel (length 2 µm) in presence of an external (out-of-plane) magnetic field, the Transversal Flux Transformer Effect can be used to produce a nonlocal voltage drop on the remote contacts caused by vortex motion in the channel. In the simplest picture, the Lorentz force acting on the vortices in the local wire creates a pressure on the vortices in the channel, such that the mutual vortex-vortex repulsion can explain the nonlocal vortex motion. However, detailed measurements of nonlocal DC voltage-current characteristics taken across the whole B-T-plane show several new aspects, including abrupt sign reversals of the vortex direction of motion. At temperatures far below the transition temperature Tc, this can be understood in terms of an interplay between Lorentz force at low current densities and Nernst effect via local electron heating at high current densities. At temperatures close to the transition temperature, the sign reversal occurs due to a competition between the Lorentz force at low current densities and a force due to the local suppression of the superconducting order parameter at high current densities." @default.
- W147131800 created "2016-06-24" @default.
- W147131800 creator A5047462146 @default.
- W147131800 date "2010-01-14" @default.
- W147131800 modified "2023-09-27" @default.
- W147131800 title "Nonlinear vortex transport in mesoscopic channels of amorphous NbGe" @default.
- W147131800 hasPublicationYear "2010" @default.
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