Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure I
TT 3.12: Vortrag
Montag, 12. März 2018, 12:30–12:45, H 0110
Transmission x-ray microscopy at low temperatures: watching superconductors at work — •Julian Simmendinger1, Stephen Ruoß1, Joachim Albrecht2, and Gisela Schütz1 — 1Max Planck Institute for Intelligent Systems, Heisenbergstr. 1, D-70569 Stuttgart, Germany — 2Research Institute for Innovative Surfaces FINO, Beethovenstr. 1, D-73430 Aalen, Germany
Scanning transmission x-ray microscopy has been used to image electric currents in superconducting films at temperatures down to 20 K. The magnetic stray field of supercurrents in a thin YBaCuO film is mapped into a soft-magnetic coating of permalloy. The so created local magnetization of the ferromagnetic film can be detected by dichroic absorption of polarized x-rays. To enable high-quality measurements in transmission geometry the whole heterostructure of ferromagnet, superconductor and single-crystalline substrate has been thinned to an overall thickness of less than 1 micron. With this novel technique local supercurrents can be analyzed in a wide range of temperatures and magnetic fields. A magnetic resolution of less than 100nm together with simultaneuosly obtained nanostructural data allow the correlation of local supercurrents with the micro- and nanostructure of the superconducting film.