Peak Effect and the Transition from Elastic to Plastic Depinning

Details Peak Effect and the Transition from Elastic to Plastic Depinning Peak Effect and the Transition from Elastic to Plastic Depinning

1998-03-04

arxiv.org/abs/cond-mat/9803050v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures. To appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.80.3851

We demonstrate for the first time an observation of the peak effect in simulations of magnetic vortices in a superconductor. The shear modulus $c_{66}$ of the vortex lattice is tuned by adding a fictitious {attractive} short range potential to the usual long-range repulsion between vortices. The peak effect is found to be most pronounced in low densities of pinning centers, and is always associated with a transition from elastic to plastic depinning. The simulations suggest in some situations that over a range of values of $c_{66}$ the production of lattice defects by a driving force enhances the pinning of the lattice.

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