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Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.71: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Correlation of Magnetism and Disordered Shiba bands in Fe Monolayer Islands on Nb(110)Julia J. Goedecke1, Lucas Schneider1, Yingqiao Ma3, •Khai Ton That1, Dongfei Wang2, Jens Wiebe1, and Roland Wiesendanger11Department of Physics - University of Hamburg, Hamburg, Germany — 2CIC Nanogune, Donostia - San Sebastian, Spain — 3Institute of Chemistry - Chinese Academy of Sciences, Beijing, China

Two-dimensional (2D) magnet-superconductor hybrid systems are intensively studied due to their potential for realizing 2D topological superconductors with Majorana edge modes. It is theoretically predicted that this quantum state can occur in spin-orbit coupled ferromagnetic or skyrmionic 2D layers in proximity to an s-wave superconductor. However, recent examples suggest, that the requirements for topological superconductivity are complicated by the multi-orbital nature of the magnetic components and disorder effects.

Here, we investigate Fe monolayer islands grown on a surface of the s-wave superconductor with the largest gap of all elemental superconductors, Nb, with respect to magnetism and superconductivity using spin-resolved scanning tunneling spectrosopy. We find three types of Fe monolayer islands which significantly differ by their reconstruction, by the magnetism and the disordered Shiba bands, without any signs of topological gaps or edge states.

Our work illustrates, that a reconstructed growth mode of magnetic layers on superconducting surfaces is detrimental for the formation of 2D topological superconductivity.

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