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O: Fachverband Oberflächenphysik

O 47: Electronic Structure of Surfaces: Magnetism and Spin Phenomena

O 47.6: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Yu-Shiba-Rusinov states and inelastic excitations in Iron Porphine molecules on Pb(111) — •Laëtitia Farinacci, Gaël Reecht, Benjamin W. Heinrich, and Katharina J. Franke — Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

When adsorbed on a superconductor, magnetic impurities couple to the quasi-particles of the substrate. This interaction induces Yu-Shiba-Rusinov (YSR) states within the BCS gap of the superconductor whose energy depends on the coupling strength. In case of a vanishing coupling, they merge with the gap edge and it may be possible to observe inelastic excitations outside of the BCS gap.

Using STM we investigate the properties of Iron Porphine molecules on a Pb(111) surface. After deposition, the molecules form islands with a hexagonal pattern. Within these islands, two different types of molecules can be identified. Type I molecules show a clover shape with a central protrusion while type II molecules have a square-like appearance. YSR states are observed above type I molecules. Depending on their surroundings type II molecules can display inelastic excitations outside the BCS gap of Pb(111).

By approaching the tip closer to the molecules we are able to tune the energies of these YSR states and inelastic excitations. In particular, the YSR states can be suppressed.