Dynamical mean field theory (DMFT) combined with finite-temperature
exact diagonalization (ED) has recently been used to study the role
of Coulomb interactions in several transition metal oxides and other
strongly correlated materials. The focus here is on iron pnictides
and chalcogenides. Although compounds such as FeAsLaO and FeSe have
similar one-electron properties, experiments suggest significant
differences. Evaluating the effect of Coulomb correlations within
ED/DMFT we show that in FeSe the formation of 3d local moments gives
rise to non-Fermi-liquid behavior. (více ...)
Magnetite (Fe3O4) is particularly
interesting at high temperature where
it shows a half-metallic behavior and possesses the high Curie
temperature of 858 K. With these remarkable characteristics, it should
be an ideal electrode material for magnetic tunnel junctions (MTJs),
ensuring a quasi infinite magnetoresistance ratio. Unfortunately, the
tunnel magnetoresistance measured with these junctions is rather small.
Relation of structure, magnetism, doping and pressure in
AFe2-xTxAs2 (A=Ca, Sr, Ba, Eu; T=Co, Rh, Ru)
Deepa Kasinathan Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187 Dresden, Germany