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O: Fachverband Oberflächenphysik

O 74: Poster Metal and Semiconductor Substrates: Structure, Epitaxy and Growth

O 74.2: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Spin-State Switching of Indium-Pthalocyanine on Pb(100) — Niklas Ide, Arnab Banerjee, •Alexander Weismann, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Kiel, Deutschland

Indium(III) phthalocyanine chloride, deposited on Pb(100), is investigated using a scanning tunnelling microscope at cryogenic temperatures. The chloride ions dissociate, leaving behind indium phthalocyanine (InPc), which is observed in two distinct configurations: the metal ion oriented either towards (↓) or away from (↑) the substrate. The study reveals isolated molecules and islands which exhibit a √65 × √65,R±30^∘ superstructure, characterized by a unit cell containing four inequivalent molecules, one in the InPc↑ state and three in the InPc↓ state at different sites. Variations in the conductance spectra of the lowest unoccupied molecular orbital are observed, depending on the adsorption sites and azimuthal orientations of the complexes. Notably, only the InPc↑ molecules within the islands exhibit Shiba states, signifying the presence of a localized spin. Electron extraction allows for the conversion of both isolated complexes and molecules in islands from the InPc↑ to InPc↓ state. This transition is accompanied by a change in their spin state, as evidenced by the disappearance of the Shiba states.

Keywords: Phthalocyanine; Yu-Shiba-Rusinov States