Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.46: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Flux dynamics in HT-superconductor thin films influenced by a surface acoustic wave — •Munise Rakel1, Arno Wirsig1, Carsten Hucho1, and Joachim Albrecht2 — 1Paul-Drude-Institut, 10117 Berlin, Germany — 2Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany
We report on magneto-optic investigations of the influence of a traveling strain wave on the magnetic flux density distribution in a type-II superconductor. The investigations are performed on a thin film of YBCO on a piezoelectric substrate using a custom-made magneto-optical microscope. The strain wave is generated by interdigital transducers on the piezoelectric substrate. An external magnetic field applied perpendicular to the surface enters the polycrystalline superconductor depending on the pinning properties. Strain-wave induced pinning-changes or SAW-induced depinning is reported to result in changes in the flux dynamics. We analyze magneto-optic greyscale images of films with dynamically altered pin-state to yield information on the influence of the combined dynamic strain- and electric field on the pinning behavior of the superconducting film.