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O: Fachverband Oberflächenphysik

O 17: Spins on surfaces at the atomic scale – Poster

O 17.10: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Defluorination of F₁₆Cu-Phthalocyanine on Superconducting Pb(100) — •Julian Skolaut, Biswajit Pabi, Alexander Weismann, and Richard Berndt — Institute for Experimental and Applied Physics, CAU Kiel, Germany

F₁₆Cu-phthalocyanine was investigated on a superconducting Pb(100) surface using low-temperature scanning tunneling microscopy. We achieved controllable defluorination of selected lobes. A single defluorinated lobe serves as a pivot point for rotation toward eight different azimuthal orientations. Defluorination of more than one lobe eliminates the ability to rotate. The energy of the lowest unoccupied molecular orbital depends on the degree of defluorination and is lowest when two lobes have been defluorinated. We also observed Yu-Shiba-Rusinov states, which exhibit shifts depending on the adsorption configuration and azimuthal orientation.

Keywords: in-situ manipulation; superconductor; magnetic impurity; on-surface rotation; phthalocyanine