Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Poster Session - Surface Magnetism

O 30.3: Poster

Montag, 16. März 2020, 18:15–20:00, P1A

Single-Co and two-site Kondo effect in atomic Cu wires on Cu(111) — •Nicolas Néel¹, Markus Bohn¹, Jörg Kröger¹, Malte Schüler², Bin Shao², Tim O. Wehling², Alexander Kowalski³, and Giorgio Sangiovanni³ — ¹Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany — ²Institute for Theoretical Physics, University Bremen, D-28359 Bremen, Germany — ³Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, D-97074 Würzburg, Germany

Linear atomic chains containing a single (two) Co and several nonmagnetic Cu atoms were assembled on Cu(111) with the tip of a STM. For single Kondo atom chains the resulting Cu_mCoCu_n clusters (0≤ m, n≤ 5) exhibit a rich evolution of the Kondo effect with the variation of m and n, as inferred from changes in the line shape of the Abrikosov-Suhl-Kondo (ASK) resonance. The most striking result is the quenching of the resonance in CuCoCu₂ and Cu₂CoCu₂ clusters. State-of-the-art first-principles calculations were performed to unravel possible microscopic origins of the experimental observations.

For linear atomic chains containing two Kondo atoms, CoCu_nCoCu_m, the addition of a Cu atom to one edge Co atom of the chain (m=0→ m=1) strongly reduces the amplitude and line width of the ASK resonance of that Co atom for all investigated chain lengths (n=2−4). On the opposite edge Co atom the Kondo effect remains unaffected. Hybridization together with the linear geometry of the cluster are likely to drive the effect.