Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: SC: Vortex Dynamics, Vortex Phases, Pinning
TT 58.4: Vortrag
Donnerstag, 17. März 2011, 18:15–18:30, HSZ 301
Quantitative interpretation of the flux lines arrangement and their physical properties in superconducting materials. — •Henry Stopfel1, Tetyana Shapoval1, Dmytro S. Inosov2, Volker Neu1, Ulrike Wolff1, Silvia Haindl1, Jan Engelmann1, Bernhard Holzapfel1, Ji Tae Park2, Dunlu L. Sun2, Chengtian T. Lin2, and Ludwig Schultz1 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
In superconducting thin films as well as in non-ideal single crystals the distribution of magnetic flux quanta is affected by existing defects. This interplay between repulsive vortex-vortex interaction and attractive pinning ends up in a strongly disordered vortex arrangement. Visualization of flux lines with magnetic force microscopy (MFM) followed by the quantitative analysis of data offers direct insight into pinning mechanism on a local scale.
We have performed quantitative analysis of MFM images of two superconductors: single crystalline BaFe2 − xCoxAs2 and NbN thin films.
Statistical evaluation of the images allows us to conclude about the existence of a short range hexagonal order in the FeAs crystal with strong pinning sites[1]. Evaluation of the measured signal in NbN thin films gives us an information about the local pinning force as well as the magnetic penetration depth.
Inosov et al. PRB 81 014513 (2010)