Single-Co Kondo Effect In Atomic Cu Wires On Cu(111)

Linear atomic chains containing a single Kondo atom, Co, and several nonmagnetic atoms, Cu, were assembled atom by atom on Cu(111) with the tip of a scanning tunneling microscope. The resulting onedimensional wires, CumCoCun (0 <= m, n <= 5), exhibit a rich evolution of the single-Co Kondo effect with the variation of m and n, as inferred from changes in the line shape of the Abrikosov-Suhl-Kondo resonance. The most striking result is the quenching of the resonance in CuCoCu2 and Cu2CoCu2 clusters. State-of-the-art firstprinciples calculations were performed to unravel possible microscopic origins of the remarkable experimental observations.