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O: Fachverband Oberflächenphysik
O 7: Spins on Surfaces at the Atomic Scale I
O 7.6: Talk
Monday, March 27, 2023, 12:00–12:15, REC C 213
Magnetic phase diagram of a YSR-molecule — •Niels P.E. van Mullekom1, Benjamin Verlhac1, Werner M.J. van Weerdenburg1, Hermann Osterhage1, Manuel Steinbrecher1, Katharina J. Franke2, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University Nijmegen, the Netherlands — 2Fachbereich Physik, Freie Universität Berlin, Germany.
Yu-Shiba-Rusinov (YSR) states arise from the exchange coupling between a local spin and a superconductor, and are strongly linked to Kondo screening. Understanding the interplay of this exchange interaction with other energy scales, as well as the role of higher spin degrees of freedom, requires magnetic field dependent characterization. To date, most studies of YSR states have been limited to bulk superconductors, which easily quench in the presence of modest magnetic fields.
Here, using high resolution milliKelvin scanning tunneling microscopy and spectroscopy, we characterize the magnetic phase diagram of a molecule on the surface of a thin film superconductor. We see nontrivial changes in the YSR excitations, that go beyond the trends that are expected in a spin 1/2 picture. We relate these changes to the various properties of the molecule, including the role of multiple channels and magnetic anisotropy. We additionally propose a model to understand the various changes in the excitation. These results provide an in-depth and detailed approach to understand the role of high spin systems in the presence of Kondo and YSR states.