Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 118: Surface Magnetism II (joint session O/MA)

O 118.2: Talk

Friday, March 20, 2020, 10:45–11:00, GER 38

YSR states in manually assembled clusters of molecules on a superconducting surface — •Jan Homberg, Manuel Gruber, Alexander Weismann, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany

The interaction between magnetic adsorbates and Cooper pairs of a superconducting substrate leads to Yu-Shiba-Rusinov (YSR) resonances. This effect has so far been investigated with low-temperature scanning tunneling microscopy (STM) on adsorbates containing a metal atom, which provides the magnetic moment. We show that non-magnetic molecules without any metal ion can acquire a net magnetic moment upon assembly into clusters as evidenced by YSR resonances. The magnetic moment is due to a partial filling of the lowest unoccupied molecular orbital of the adsorbed molecules. We show that the filling and the corresponding magnetic moment depend on the number of neighboring molecules, on their relative orientations, and on the positions of hydrogen atoms in neighboring molecules. The YSR resonances are due to fractional charges that we analyze using an Anderson-like model.

Support via the European Union’s Horizon 2020 research and innovation programme (766726) is acknowledged.