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O: Fachverband Oberflächenphysik
O 7: Electronic Structure of Surfaces: Magnetism and Spin Phenomena
O 7.7: Talk
Monday, March 20, 2017, 12:00–12:15, WIL C107
Magnetic character of holmium atom adsorbed on platinum surface — Alexander Shick1, Dmitry Shapiro2, Jindrich Kolorenc1, and •Alexander Lichtenstein3 — 1Institute of Physics ASCR, Prague, Czech Republic — 2Institute of Radio Engineering and Electronics RAS, Moscow, Russia — 3University of Hamburg, Hamburg, Germany
We address recent controversy concerning the magnetic state of holmium adatom on platinum surface. Within a combination of the density functional theory (DFT) with the exact diagonalization (ED) of Anderson impurity model, the ⟨ Jz ⟩ = 0 paramagnetic ground state is found. In an external magnetic field, this state is transformed to a spin-polarized state with ⟨ Jz ⟩ = 6.6−6.8. We emphasize the role of 5d-4f interorbital exchange polarization in modification of the 4f shell energy spectrum. It is further suggested that when an external magnetic field is removed, the spin-polarized state relaxes back to the paramagnetic state through an intermediate quasi-degenerate and magnetically unstable state overruling the existence of long living magnetic moment, and the magnetic remanence for Ho adatom on Pt surface.