Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets

Details Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets

2005-04-21

arxiv.org/abs/cond-mat/0504549v2

Eur. Phys. J. B45, 1 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, final version

Scientific paper

10.1140/epjb/e2005-00157-8

It is proven that the sum rules for X-ray magnetic dichroism (XMCD) spectra that are used to separate spin and orbital contributions to the magnetic moment are formally correct for an arbitrary strength of electron-electron interactions. However, their practical application for strongly correlated systems can become complicated due to the spectral density weight spreading over a broad energy interval. Relevance of incoherent spectral density for the XMCD sum rules is illustrated by a simple model of a ferromagnet with orbital degrees of freedom.

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