Turbulent relaxation in the vortex lattice
Department of Physics, University of Oslo, Blindern, N-0316
2 Department of Physics, Bar-Ilan University, Ramat Gan 52900, Israel
Accepted: 5 January 1998
The time dependence of flux patterns of an untwinned YBa2Cu3O single crystal showing the “meandering instability” is observed at using magneto-optical imaging. When applying a reversed external field to a remanent state, along the front of penetrating antivortices, flux droplets are formed which can separate from the flux front and move in a spiral-like fashion. It is shown that the vortices along the flux front are in fast motion. These observations are discussed using a newly developed theory. Furthermore, the flux patterns are analyzed in terms of flux creep.
PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 78.20.Ls – Magnetooptical effects
© EDP Sciences, 1998