SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 20: Poster: Spins and Magnetism at Surfaces

O 20.9: Poster

Monday, March 27, 2023, 18:00–20:00, P2/EG

Scanning tunneling spectroscopy of a spin-crossover complex on a superconductor — •Marten Treichel¹, Florian Gutzeit², Jan Homberg¹, Rainer Herges², Richard Berndt¹, and Alexander Weismann¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany — ²Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany

A spin-crossover complex based on Ni-porphyrin is studied on superconducting Pb(100) using scanning tunneling spectroscopy at 0.3 K. A pronounced molecule-induced surface faceting is found with molecular chains located at multiple substrate steps. The step orientations deviate from the high-symmetry directions of the substrate and appear to be imposed by molecular interactions. Monatomic substrate steps remain undecorated. Conductance spectra reveal spin-flip excitations with clear spatial variations. The data suggest that neighbor molecules are rotated by 90^∘ with respect to each other. We find that an S=1 quantum spin model with the hard axis tilted away from the surface normal reproduces spectra measured in magnetic fields up to 9 T.