Kondo peak splitting on a single adatom coupled to a magnetic cluster

S. L. Kawahara , J. Lagoute (1) , V. Repain (1) , C. Chacon (1) , Y. Girard (2) , J. Klein (3) , S. Rousset (1)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 INRETS/MA - Département Mécanismes d'Accidents
3 UMN - University of Minnesota [Twin Cities]

The Kondo resonance induced by a single cobalt adatom interacting with a ferromagnetic iron nanocluster is measured using low-temperature scanning tunneling microscopy. The persistence of the Kondo resonance is evidenced along with the predicted splitting of the spectral density peak for a Kondo impurity surrounded by a spin-polarized electron bath. Reversible quenching of the split feature is observed using atom manipulation between adjacent adsorption sites. Using a Green's-function formalism, we model a double Fano resonance leading to a quantitative insight of our observations.

Domaines: Physique [physics]

S. L. Kawahara, J. Lagoute, V. Repain, C. Chacon, Y. Girard, et al.. Kondo peak splitting on a single adatom coupled to a magnetic cluster. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82 (2). ⟨hal-01987571⟩