Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Poster: Electronic structure: Surface Magnetism and Spin Phenomena

O 52.4: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster B

Evolution of the Kondo effect in ConCum chains — •neda noei, alexander weismann, and richard berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany

Using a low temperature scanning tunneling microscope, monatomic Cu chains with lengths up to 100 nm were fabricated. By dipping the STM tip into Cu(111), different kinds of dislocations were generated. Among these dislocations, long Cu chains are an interesting system to investigate spin interaction between magnetic atoms. Two interacting magnetic atoms can be considered as a prototype system for spin exchange correlations. We attached Co adatoms to monatomic Cu chains to investigate how their adsorption sites and their distance from each other affect spin correlations between them. We observed a significant change of Kondo resonance when a Co atom was attached to the chain. This can be addressed to directional hybridization of Co atom d-orbitals to the chain. Moreover, by adding Co atom to the end of the chain, the Kondo resonance broadens appreciably. We have shown that the amplitude and width of Kondo resonance depends on the distance between Co atoms at chain.