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O: Fachverband Oberflächenphysik

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

O 110.3: Vortrag

Donnerstag, 19. März 2020, 15:30–15:45, WIL A317

Kondo effect of a singly occupied molecular orbital in bis(phthalocyaninato)-dysprosium double decker molecules — •Timo Frauhammer¹, Timofey Balashov^{1, 2}, Gabriel Derenbach¹, Svetlana Klyatskaya³, Eufemio Moreno-Pineda³, Mario Ruben³, and Wulf Wulfhekel^{1, 3} — ¹Physikalisches Institut, Karlsruhe Institute of Technology, Germany — ²II. Physikalisches Institut, RWTH Aachen, Germany — ³Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany

Double decker bis(phthalocyaninato)-dysprosium single molecule magnets adsorbed on Au(111) have been investigated using low temperature STM. No direct magnetic signal by the 4f electrons could be detected in STS. However, a clear Kondo resonance located on the ligands of the molecules can be observed. This indicates an odd number of electrons residing in the molecular orbitals of the ligands. Interestingly, a splitting of this Kondo resonance has been observed even in the absence of external magnetic fields, which can be attributed to a ferromagnetic exchange coupling between the unpaired spin on the ligands and the 4f angular momentum of the Dy central ion. Using spin-polarized tips, this might enable the readout of the 4f spin of Dy.