Conductance-driven change of the Kondo effect in a single cobalt atom

Phys Rev Lett. 2012 Jun 29;108(26):266803. doi: 10.1103/PhysRevLett.108.266803. Epub 2012 Jun 26.


A low-temperature scanning tunneling microscope is employed to build a junction comprising a Co atom bridging a copper-coated tip and a Cu(100) surface. An Abrikosov-Suhl-Kondo resonance is evidenced in the differential conductance and its width is shown to vary exponentially with the ballistic conductance for all tips employed. Using a theoretical description based on the Anderson model, we show that the Kondo effect and the total conductance are related through the atomic relaxations affecting the environment of the Co atom.