Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state.

ABSTRACT: Under the influence of a constant drive the moving vortex state in 2H-NbS₂ superconductor exhibits a negative differential resistance (NDR) transition from a steady flow to an immobile state. This state possesses a high depinning current threshold ([Formula: see text]) with unconventional depinning characteristics. At currents well above [Formula: see text], the moving vortex state exhibits a multimodal velocity distribution which is characteristic of vortex flow instabilities in the NDR regime. However at lower currents which are just above [Formula: see text], the velocity distribution is non-Gaussian with a tail extending to significant negative velocity values. These unusual negative velocity events correspond to vortices drifting opposite to the driving force direction. We

SUBMITTER: Bag B 

PROVIDER: S-EPMC5514132 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature