Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: Focus Session: Spins on Surfaces II (joint session O/MA)
MA 49.6: Vortrag
Donnerstag, 4. April 2019, 16:30–16:45, H15
Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport — •Laëtitia Farinacci1, Gelavizh Ahmadi1, Gaël Reecht1, Michael Ruby1, Nils Bogdanoff1, Olof Peters1, Benjamin W. Heinrich1, Felix von Oppen2, and Katharina J. Franke1 — 1Freie Universität Berlin, Germany — 2Dahlem Center for Complex Systems, Berlin, Germany
Magnetic impurities on superconductors induce via exchange scattering local bound states, so called Yu-Shiba-Rusinov states, in their vicinity. Depending on the coupling strength between the impurity and the substrate, the system can be in a free- or screened-spin ground state.
Here, we use the flexibility of a Fe-porphin molecule on a Pb(111) surface to tune continuously and reversibly between these ground states. By approaching the STM tip toward the molecule we modify on the one hand the bound state energy and on the other hand the junction transport properties so that we can resolve the YSR excitations by single-electron as well as by (multiple) Andreev reflections. [1]
[1] Farinacci et al., PRL 121, 196803 (2018)