Reversal of nonlocal vortex motion in the regime of strong nonequilibrium.
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 V{nl}. At a high I of a given polarity, V{nl} changes sign dramatically. This is followed by V{nl} becoming even in I, with the opposite sign at low and high temperatures T. These findings can be explained by a Nernst-like effect resulting from local electron overheating (low T), and a magnetization enhancement due to a nonequilibrium quasiparticle distribution that leads to a gap enhancement near the vortex core (high T).
Otto
Florian
F
Institute for Experimental and Applied Physics, University of Regensburg, D-93025 Regensburg, Germany.
Bilusić
Ante
A
Babić
Dinko
D
Vodolazov
Denis Yu
DY
Sürgers
Christoph
C
Strunk
Christoph
C