Hydrodynamic Instability of the Flux-antiflux Interface in Type-II Superconductors

Details Hydrodynamic Instability of the Flux-antiflux Interface in Type-II Superconductors Hydrodynamic Instability of the Flux-antiflux Interface in Type-II Superconductors

2001-03-02

arxiv.org/abs/cond-mat/0103058v1

Physics

Condensed Matter

Superconductivity

12 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.247005

The macroturbulence instability observed in fluxline systems during remagnetization of superconductors is explained. It is shown that when a region with flux is invaded by antiflux the interface can become unstable if there is a relative tangential flux motion. This condition occurs at the interface when the viscosity is anisotropic, e.g., due to flux guiding by twin boundaries in crystals. The phenomenon is similar to the instability of the tangential discontinuity in classical hydrodynamics. The obtained results are supported by magneto-optical observations of flux distribution on the surface of a YBCO single crystal with twins.

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