Strongly correlated materials: ARPES vs LDA/DMFT
Ansgar Liebsch
Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
|
The investigation of the electronic properties
of strongly correlated materials using ARPES is
complicated because of the superposition of bulk
and surface contributions. Initial inconsistencies
between ARPES data, on the one hand, and bulk data
and LDA/DMFT predictions, on the other hand, in
systems such as SrxCa1-xVO3, SrxCa1-xRuO3
and SrxCa2-xRuO4 were resolved by identification
of surface-induced modification of single-particle
and many-body features. Recent ARPES data and
LDA/DMFT predictions on NaxCoO2 also exhibit a
striking, qualitative discrepancy. Possible reasons
for this inconsistency will be discussed.
|