[Zurück]

A. Valli, M. Bahlke, A. Kowalski, M. Karolak, C. Herrmann, G. Sangiovanni:
"Kondo screening in Co adatoms with full Coulomb interaction";
Physical Review Research, 2 (2020), S. 033432-1 - 033432-14.

Using a numerically exact first-principles many-body approach, we revisit the "prototypical" Kondo case of a cobalt impurity on copper. Even though this is considered a well understood example of the Kondo effect, we reveal an unexpectedly strong dependence of the screening properties on the parametrization of the local Coulomb tensor. As a consequence, the Kondo temperature can vary by orders of magnitude depending on the complexity of the parametrization of the electron-electron interaction. Further, we challenge the established picture of a spin-1 moment involving two cobalt d orbitals only, as orbital-mixing interaction terms boost the contribution of the remainder of the d shell.

http://dx.doi.org/10.1103/PhysRevResearch.2.033432