Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework

Details Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework

2011-05-19

arxiv.org/abs/1105.3804v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures, 1 table, 8 pages

Scientific paper

The theoretical description of photoemission spectra of transition metals was greatly improved recently by accounting for the correlations between the d electrons within the local spin density approximation (LSDA) plus dynamical mean field theory (DMFT). We assess the improvement of the LSDA+DMFT over the plain LSDA in x-ray absorption spectroscopy, which --- unlike the photoemission spectroscopy --- is probing unocccupied electronic states. By investigating the L2,3-edge x-ray absorption near-edge structure (XANES) and x-ray magnetic circular dichroism (XMCD) of Fe, Co, and Ni, we find that the LSDA+DMFT improves the LSDA results, in particular concerning the asymmetry of the L3 white line. Differences with respect to the experiment, nevertheless, remain --- particularly concerning the ratio of the intensities of the L3 and L2 peaks. The changes in the XMCD peak intensities invoked by the use of the LSDA+DMFT are a consequence of the improved description of the orbital polarization and are consistent with the XMCD sum rules. Accounting for the core hole within the final state approximation does not generally improve the results. This indicates that to get more accurate L2,3-edge XANES and XMCD spectra, one has to treat the core hole beyond the final state approximation.

Affiliated with

Also associated with

No associations

Rating

Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Many-body effects in x-ray absorption and magnetic circular dichroism spectra within the LSDA+DMFT framework will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-68874