Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 51: Surface and Interface Magnetism I (O jointly with MA)

O 51.1: Talk

Wednesday, April 2, 2014, 10:30–10:45, WIL C107

Tracing the RKKY-interaction in pairs of adatoms via the peak splitting of a Kondo resonance — Alexander Ako Khajetoorians¹, •Manuel Steinbrecher¹, Mohammed Bouhassoune², Samir Lounis², Markus Ternes³, Jens Wiebe¹, and Roland Wiesendanger¹ — ¹Institute of Applied Physics, Universität Hamburg, 20355 Hamburg, Germany — ²Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ³Max-Planck Institut für Festkörperphysik, 70569 Stuttgart, Germany

Ruderman-Kittel-Kasuya-Yoshida (RKKY)-interaction is an indirect exchange interaction between localized magnetic moments in a host mediated by conduction electrons, which oscillates between ferromagnetic and anti-ferromagnetic coupling as a function of distance [L. Zhou et al., Nat. Phys. 6, 187 (2010)]. We performed scanning tunneling spectroscopy at 300 mK on a Fe-H complex and a clean Fe atom, both adsorbed on Pt(111), for different spacing between the atom and the complex. While the Fe atom shows the well known spin excitation [A. A. Khajetoorians et al., Phys. Rev. Lett. 111, 157204 (2013)], the hydrogen complex shows a Kondo resonance. As a result of the RKKY-interaction the Kondo resonance reveals a distance dependent peak splitting. Fitting the spectra to model calculations including the coupling to the substrate electrons in third order perturbation enables to determine the distance dependency of the RKKY-interaction, which we compare to our first principles calculations.