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O: Fachverband Oberflächenphysik
O 118: Surface Magnetism II (joint session O/MA)
O 118.1: Vortrag
Freitag, 20. März 2020, 10:30–10:45, GER 38
Observation of tunable single-atom Yu-Shiba-Rusinov states — •Artem B. Odobesko1, Domenico DiSante2, Alexander Kowalski2, Felix Friedrich1, Ronny Thomale2, Giorgio Sangiovanni2, and Matthias Bode1 — 1Physikalisches Institut, Universität Würzburg, Am Hubland, Würzburg, Germany — 2Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, Würzburg, Germany
Through scanning tunneling spectroscopy, we analyze the interdependence of Kondo screening and superconductivity. Our data obtained on single Fe adatoms on Nb(110) show that the coupling and the resulting Yu-Shiba-Rusinov (YSR) bound states are strongly adsorption site-dependent and exhibit a quantum phase transition, where two YSR resonances cross at zero bias. By sweeping the external magnetic field to turn off and on superconductivity in the Nb substrate, we were able to study the interaction of individual magnetic adatoms with the normal-metallic or superconducting substrate in two consecutive experiments. The data show that the in-gap position of YSR states scales with the Kondo temperature and exhibits a cross-over at 0.7 Δ, in good agreement with theoretically predicted value. The observed experimental signatures are rationalized by combined density functional theory and continuous-time quantum Monte-Carlo calculations. This treatment shows that the size of the magnetic moment and the hybridization of the impurity orbitals with the substrate are key parameters for understanding the interaction between magnetic adatoms and superconductors.