Reversal of Nonlocal Vortex Motion in the Regime of Strong Nonequilibrium

Details Reversal of Nonlocal Vortex Motion in the Regime of Strong Nonequilibrium Reversal of Nonlocal Vortex Motion in the Regime of Strong Nonequilibrium

2009-08-26

arxiv.org/abs/0908.3884v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We investigate nonlocal vortex motion in weakly pinning a-NbGe nanostructures, which is driven by a transport current I and remotely detected as a nonlocal voltage Vnl. At high I, the measured Vnl exhibits dramatic sign reversals that at low and high temperatures T occur for opposite polarities of I. The sign of Vnl becomes independent of that of the drive current at large abs(I). These unusual effects can be nearly quantitatively explained by a novel enhancement of magnetization, arising from a nonequilibrium distribution of quasiparticles at high T, and a Nernst-like effect resulting from local electron heating at low T.

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