Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.6: Vortrag

Donnerstag, 19. März 2020, 16:15–16:30, WIL A317

Probing intramolecular metal-ligand spin coupling by STM — •yuqi wang1, soroush arabi1, klaus kern1,2, and markus ternes3,41Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 2École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland — 3RWTH Aachen University, Institute of Physics, D-52074 Aachen, Germany — 4Peter-Grünberg-Institute, Forschungszentrum Jülich, D-52425 Jülich, Germany

The bonding of metal-organic molecules to a substrate induces molecular ligand spin states, which lead to an intramolecular conductance and spin dynamics [1]. However, the intramolecular spin coupling has not been studied in detail at molecular scale yet. Here we use a low-temperature scanning tunneling microscope (STM) to study cobalt phthalocyanine (CoPc) molecules on a 2H-NbSe2 substrate. We observe that there are two kinds of adsorbed CoPc molecules due to two slightly different adsorption geometries. While one behaves like a S = 1/2 system which introduces Yu-Shiba-Rusinov states in the superconducting gap of the substrate [2], the other behaves like an effective S = 0 system which shows a singlet-triplet transition at about 23 meV due to the antiferromagnetic coupling between the central Co atom of the metal-organic complex and its ligands. [1] A. Mugarza, et al., Nat. Comm. 2, 490 (2011). [2] S. Kezilebieke, et al., Nano Lett. 18, 2311 (2018).

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