Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 58: Surface magnetism II

MA 58.3: Talk

Friday, March 16, 2018, 10:00–10:15, EB 202

Tuning a Yu-Shiba-Rusinov state across a quantum phase transition — •Laëtitia Farinacci, Gelavizh Ahmadi, Gaël Reecht, Michael Ruby, Benjamin W. Heinrich, and Katharina J. Franke — Freie Universität Berlin, Arnimallee 14, 14195 Berlin

Magnetic impurities on superconductors induce an exchange scattering potential that locally perturbs the pairing of the superconductor's electrons. This leads to the presence of Yu-Shiba-Rusinov (YSR) states within the gap of the superconductors whose energy depends on the coupling strength between the impurity and Cooper pairs. In particular, upon increase of this coupling strength, the ground state of the system undergoes a quantum phase transition from a free to a screened spin state.

Here, we investigate YSR states induced by Fe-porphin molecules on Pb(111). Upon tip approach we are able to continuously tune their energy across the Fermi energy and thus study, on the single impurity level, such a quantum phase transition.