Fyzikální ústav Akademie věd ČR

Seminar Thursday, 01/11/2012 14:00

Speakers: Jan Kuneš
Place: Seminary room at the Library of the Institute of Physics ASCR, Cukrovarnická 10, Praha 6
Presented in English
Organisers: Department of Magnetics and Superconductors

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.