Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 28: Magnetic Materials

MA 28.10: Vortrag

Mittwoch, 13. März 2013, 17:30–17:45, H22

Nature of local moments in La(Sr)CoO3 — •Jan Kunes and Vlastimil Krapek — Institute of Physics, AS CR, Prague, Czechia

We present a numerical study of magnetic properties of LaCoO3 and SrCoO3 using the dynamical mean-field theory. In particular, we investigate the origin of the local magnetic moments (Curie susceptibility). Using the decomposition of the temporal spin-spin correlation functions into contributions from atomic multiplets we generalize the notion of atomic multiplets to situations with the strong covalent bonding. We show that the magnitude of the local moment is in general not a good parameter to identify the microscopic atomic states underlying the formation of local magnetic moments. Our numerical results exclude the so called intermediate spin states to play an important role in magnetism of LaCoO3.