Kondo versus magnetic coupling of cobalt dimers in a CuO (2 × 1) reconstruction

Andreas Gumbsch (1, 2) , Giovanni Barcaro (1) , Mike G Ramsey (1) , Svetlozar Surnev (1) , Alessandro Fortunelli (1) , Falko P Netzer

1 Surface and Interface Physics
2 Molecular Modeling Laboratory

Co atoms and dimers embedded in a Cu(110)(2x1)-O surface oxide are investigated via lowtemperature STM/STS experiments and first-principles simulations. It is found that Co dimers incorporated into adjacent rows of the Cu(110)(2x1)-O reconstruction show Kondo resonances decoupled from each other, whereas they are anti-ferromagnetically coupled (and do not exhibit Kondo effect) when they are aligned on the same row. This shows that it is possible to decouple single carriers of the Kondo effect via a proper choice of the adsorption and host geometry. It is also shown that an oxidic environment presents features remarkably different from those of pure metal substrates.

Mots clés: Physical Sciences

Andreas Gumbsch, Giovanni Barcaro, Mike G Ramsey, Svetlozar Surnev, Alessandro Fortunelli, et al.. Kondo versus magnetic coupling of cobalt dimers in a CuO (2 × 1) reconstruction. Journal of Physics: Condensed Matter, 2010, 22 (22), pp.222202. ⟨10.1088/0953-8984/22/22/222202⟩. ⟨hal-00617069⟩