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O: Fachverband Oberflächenphysik
O 98: Electronic structure: Surface magnetism and spin phenomena I
O 98.8: Talk
Thursday, March 15, 2018, 17:00–17:15, MA 042
Yu-Shiba-Rusinov states of magnetic adatoms on the quasi 2D superconductor 2H-NbSe2 — •Eva Liebhaber1, Rojhat Baba1, Lisa Rütten1, Michael Ruby1, Sebastian Rohlf2, Kai Rossnagel2, Benjamin W. Heinrich1, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany. — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
A magnetic impurity adsorbed on a superconducting substrate yields so-called Yu-Shiba-Rusinov (YSR) states. These are low energy bound states inside the superconducting energy gap locally induced by magnetic exchange scattering. 2H-NbSe2 belongs to the class of transition metal dichalcogenides and is a layered van der Waals material with strong 2D character. In this material, superconductivity coexists with a charge density wave (CDW) at low temperatures.
Here, we investigate YSR states of single transition metal atoms adsorbed on the surface of 2H-NbSe2 using low temperature scanning tunneling microscopy and spectroscopy. We observe variations in d state resonances as well as in the YSR excitations. We can link these variations to the adsorption in two distinct atomic sites. Furthermore, the energy of the YSR states and their spatial extend appear to be influenced by the CDW.