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Paper detail

Two-Site Kondo Effect in Atomic Chains

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 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.

preprint2011arXivOpen access
N. NéelR. BerndtJ. KrögerT. O. WehlingA. I. LichtensteinM. I. Katsnelson
cond-mat.mtrl-sci
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N. NéelR. BerndtJ. KrögerT. O. WehlingA. I. LichtensteinM. I. Katsnelson

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