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O: Fachverband Oberflächenphysik
O 11: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies II
O 11.1: Topical Talk
Montag, 18. März 2024, 15:00–15:30, MA 004
Unusual magnetism of closed-shell molecules on metal substrates — •Alexander Weismann1, Arnab Banerjee1, Manuel Gruber2, Jan Homberg1, Niklas Ide1, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany
Molecular magnetism is studied using low temperature scanning tunneling spectroscopy by resolving spectroscopic fingerprints close to the Fermi energy like Kondo resonances, inelastic spin excitations and Yu-Shiba-Rusinov (YSR) states. We find a variety of closed-shell molecules that can become paramagnetic in suitable environments or by molecular switching. Furthermore, an unexpectedly large orbital moment related to molecular ring currents is observed. Using YSR states we sensitively detect a large number of molecular vibrations via inelastic tunneling. Magnetic and vibrational excitations are spatially mapped and energy shifts caused by intermolecular interactions are resolved on a 100 µeV scale. Taken together our results highlight the importance of electrostatic stray fields due to polar bonds in molecules.
Keywords: Molecular magnetism; Kondo effect; Yu-Shiba-Rusinov states; Spin excitations; molecular vibrations