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A low-temperature scanning tunneling microscope was employed to study thedifferential conductance in an atomic junction formed by an adsorbed Co atom ona Cu(100) surface and a copper-covered tip. A zero-bias anomaly (ZBA) revealsspin scattering off the Co atom, which is assigned to a Kondo effect. The ZBAexhibits a characteristic asymmetric lineshape when electrons tunnel betweentip and sample, while upon the tip-Co contact it symmetrizes and broadens.Through density functional theory calculations and the non-equilibriumnon-crossing approximation we show that the lineshape broadening is mainly aconsequence of the additional coupling to the tip, while non-equilibriumeffects only modify the large-bias tails of the ZBA.

From tunneling to contact in a magnetic atom: the non-equilibrium Kondo effect