The Labusch parameter of a driven flux line lattice in YBa2Cu3O7 superconducting films
Department of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Universität Leipzig, Linnéstrasse 5, 04103 Leipzig, Germany
Published online: 15 October 2000
We have investigated the influence of a driving force on the elastic coupling (Labusch parameter) of the field-cooled state of the flux line lattice (FLL) in 400 nm thick YBa2Cu3O7 superconducting films. We found that the FLL of a field-cooled state without driving forces is not in an equilibrium state. Results obtained for magnetic fields applied at and 30 relative to CuO2 planes, show an enhancement of the elastic coupling of the films at driving current densities several orders of magnitude smaller than the critical one. Our results indicate that the FLL appears to be in a relatively ordered, metastable state after field cooling without driving forces.
PACS: 74.76.Bz – High-Tc films / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000