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O: Fachverband Oberflächenphysik
O 30: Poster Session - Surface Magnetism
O 30.1: Poster
Montag, 16. März 2020, 18:15–20:00, P1A
Study of Magnetic Molecules on Superconductors by STM/AFM — •soroush arabi1, yuqi wang1, klaus kern2, and markus ternes3,4 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 2École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — 3RWTH Aachen University, Institute of Physics, D-52074 Aachen, Germany — 4Peter-Grünberg-Institute (PGI-3), Forschungszentrum Jülich, D-52425 Jülich, Germany
We use a combined scanning tunneling microscope (STM) and atomic force microscope (AFM) to investigate the interplay of magnetism and superconductivity in single magnetic molecules adsorbed on s-wave superconductors. For this study, we use cobalt phthalocyanine (CoPc) adsorbed on NbSe2 and Fe-porphin (FeP) adsorbed on Pb(111). Such proximity offers a rich spectrum of phenomena, due to the formation of Yu-Shiba-Rosinov (YSR) states inside the superconducting gap which at strong enough interaction can screen the magnetic moment by breaking off a cooper pair [1]. Taking advantage of the unique capabilities of the AFM, we can dynamically drive the ground state of FeP/Pb(111) towards or away from such a quantum phase transition by manipulating the exchange interaction between the molecule and substrate while tracking the interacting force. Moreover, we show that symmetry-reduced adsorption sites for CoPc molecules leads to a singlet ground state and a sharp molecular singlet-triplet transition at an energy outside the superconducting gap of the NbSe2.
[1] Laetitia Farinacci, et al., Phys. Rev. Lett. 121, 196803 (2018).