SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Spins on Surfaces at the Atomic Scale III

O 33.5: Vortrag

Dienstag, 28. März 2023, 11:45–12:00, REC C 213

Absence of the Kondo effect for Co on Cu(111) — Neda Noei¹, Roberto Mozara², Ana M. Montero³, Sascha Brinker³, Niklas Ide¹, Filipe S. M. Guimaraes³, Alexander I. Lichtenstein², Richard Berndt¹, Samir Lounis³, and •Alexander Weismann¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — ²Institut für Theoretische Physik, Universität Hamburg, D-20355 Hamburg, Germany — ³Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

The zero-bias anomaly in conductance spectra of single Co atoms on Cu(111) observed at ≈ 4 K, which has been interpreted as being due to a Kondo resonance, is strongly modified when the Co atoms are attached to monatomic Cu chains. Scanning tunneling spectra measured at 340 mK in magnetic fields exhibit all characteristics of spin-flip excitations. Their dependence on the magnetic field reveals a magnetic anisotropy and suggests a non-collinear spin state indicating that spin-orbit coupling (SOC), which has so far been neglected in theoretical studies of Co/Cu(111), has to be taken into account. According to our density functional theory and multi-orbital quantum Monte Carlo calculations SOC suppresses the Kondo effect for all studied geometries. The interpretation of the zero-bias anomaly in terms of a Kondo resonance is apparently incorrect.