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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.31: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Two-site Kondo effect in atomic chains — Nicolas Néel¹, Richard Berndt¹, •Jörg Kröger², Tim Wehling³, Alexander Lichtenstein³, and Mikhail Katsnelson⁴ — ¹University of Kiel, Germany — ²Technical University of Ilmenau, Germany — ³University of Hamburg, Germany — ⁴University of Nijmegen, The Netherlands

Linear CoCu_nCo clusters on Cu(111) are fabricated by means of atomic manipulation. They represent a two-site Kondo system with tunable interaction. Scanning tunnelling spectroscopy reveals oscillations of the Kondo temperature T_K with the number n of Cu atoms for n≥ 3. Density functional calculations show that the Ruderman-Kittel-Kasuya-Yosida interaction mediated by the Cu chains causes the oscillations. Calculations find ferromagnetic and antiferromagnetic interaction for n=1 and 2, respectively. Both interactions lead to a decrease of T_K as experimentally observed. Financial support through SFB 668 is acknowledged.