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Verhandlungen
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DPG

Berlin 2012 – scientific programme

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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

Tuesday, March 27, 2012, 18:15–21:45, Poster B

Two-site Kondo effect in atomic chainsNicolas Néel1, Richard Berndt1, •Jörg Kröger2, Tim Wehling3, Alexander Lichtenstein3, and Mikhail Katsnelson41University of Kiel, Germany — 2Technical University of Ilmenau, Germany — 3University of Hamburg, Germany — 4University of Nijmegen, The Netherlands

Linear CoCunCo 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 TK 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 TK as experimentally observed. Financial support through SFB 668 is acknowledged.

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