Fyzikální ústav Akademie věd ČR

Seminář Čtvrtek, 01.11.2012 14:00

Přednášející: Jan Kuneš
Místo: Seminární místnost u knihovny FZÚ AVČR, Cukrovarnická 10, Praha 6.
Jazyk: anglicky
Pořadatelé: Oddělení magnetik a supravodičů

In strongly correlated materials the local charge fluctuations are strongly suppressed and a single atomic multiplet typically dominates among the states visited by any given atom. In some materials, however, several multiplets may happen to be competing giving rise to strong temperature dependence of physical quantities, such as the magnetic susceptibility or conductivity. Cobaltites of the LaCoO₃ family are a well known example. We use the dynamical mean-field theory (DMFT) to investigate these effects using a minimal 2-band Hubbard model as well as multi-band models of LaCoO₃ and SrCoO₃ obtained from ab-initio band structures.