Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning

TT 26.2: Vortrag

Mittwoch, 27. Februar 2008, 16:00–16:15, H 3010

Vortex Matter and Vortex Manipulation in Mesoscopic Superconducting Systems — •Roger Wördenweber¹, Eugen Hollmann¹, Jürgen Schubert¹, Rolf Kutzner¹, Konstantin Ilin², and Michael Siegel² — ¹Institute for Bio- and Nanosystems and cni - Center of Nanoelectronic Systems for Information Technology, Research Center Jülich — ²Institute for Micro- and Nano-Electronic Systems, University of Karlsruhe

The understanding of the properties of Abrikosov vortices in mesoscopic superconducting systems that are exposed to low and high-frequencies electric fields is of interest for basic aspects of vortex matter and for potential application of superconductivity in fluxonic devices. We report on theoretical aspects and new experiments on vortex matter in patterned superconducting films. The impact of micropatterns on the vortex mobility and vortex manipulation is examined for frequencies ranging from dc to 20GHz. Conventional superconducting films (Nb and NbN) as well as HTS films (YBCO) are examined. The manipulation of the vortices in thin films is achieved either by patterning with various hole arrays (antidots of different size and geometry) or by adding nanodots. The mobility and the manipulation of the direction of vortex motion by the micro and nanostructures are analyzed as function of frequency. Vortex diodes are generated by asymmetric pinning or an additional vortex driving potential provided by a dc current. The diode effect is demonstrated for different frequency regimes.