Sum rules for X-ray magnetic circular dichroism spectra in strongly correlated ferromagnets |
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| Authors: | V Yu?Irkhin Email author" target="_blank">M I?KatsnelsonEmail author |
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| Institution: | (1) Institute of Metal Physics, 620219 Ekaterinburg, Russia;(2) Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands |
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| 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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