Dynamics of two-dimensional pancake vortices in layered superconductors
- Institute for Physics of Microstructures, Russian Academy of Sciences, 603600, Nizhny Novgorod, 46 Uljanov Street (Russia)
The dynamics of two-dimensional (2D) pancake vortices in Josephson-coupled superconducting/normal-metal multilayers is considered within the time-dependent Ginzburg-Landau theory. For temperatures close to {ital T}{sub {ital c}} a viscous drag force acting on a moving 2D vortex is shown to depend strongly on the conductivity of normal-metal layers. For a tilted vortex line consisting of 2D vortices the equation of viscous motion in the presence of a transport current parallel to the layers is obtained. The specific structure of the vortex line core leads to substantial deviations from the Bardeen-Stephen theory. The viscosity coefficient is found to depend essentially on the angle {gamma} between the magnetic field {ital B} and the {ital c} axis normal to the layers. For field orientations close to the layers the nonlinear effects in the vortex motion appear even for slowly moving vortex lines (when the in-plane transport current is much smaller than the Ginzburg-Landau critical current). In this nonlinear regime the viscosity coefficient depends logarithmically on the vortex velocity {ital V}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 434498
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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