title: Two-site Kondo effect in atomic chains.
abstract: Linear CoCu(n)Co clusters on Cu(111) fabricated by atomic manipulation represent a two-site Kondo system with tunable interaction. Scanning tunneling 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.
authors: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.
authors: N
authors: N
authors: Néel
authors: R
authors: R
authors: Berndt
authors: J
authors: J
authors: Kröger
authors: T O
authors: TO
authors: Wehling
authors: A I
authors: AI
authors: Lichtenstein
authors: M I
authors: MI
authors: Katsnelson