Abstract.
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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Irkhin, V., Katsnelson, M. Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets. Eur. Phys. J. B 45, 1–4 (2005). https://doi.org/10.1140/epjb/e2005-00157-8
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DOI: https://doi.org/10.1140/epjb/e2005-00157-8