Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets
arXiv:cond-mat/0504549 · doi:10.1140/epjb/e2005-00157-8
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.
4 pages, final version