Repozytorium publikacji - Politechnika Gdańska

The electronic structure of selected rare-earth atoms adsorbed on a free-standing graphene was investigated using methods beyond the conventional density functional theory (DFT+U, DFT +HIA, and DFT+ED). The influence of the electron correlations and the spin-orbit coupling on the magnetic properties has been examined. The DFT+U method predicts both atoms to carry local magnetic moments (spin and orbital) contrary to a nonmagnetic f6 (J=0) ground-state configuration of Sm in the gas phase. Application of DFT+Hubbard-I (HIA) and DFT+exact diagonalization (ED) methods cures this problem, and yields a nonmagnetic ground state with six f electrons and J=0 for the Sm adatom. Our calculations show that Nd adatom remains magnetic, with four localized f electrons and J=4.0. These conclusions could be verified by STM and XAS experiments.

Autorzy

• Agnieszka Kozub link otwiera się w nowej karcie ,
• Alexander Shick,
• František Máca,
• Jindřich Kolorenč,
• Alexander Lichtenstein