Abstract
We present studies of orbital magnetic moments of CrO 2 and Fe 3O 4 by measuring magnetic circular dichroism (MCD) in soft X-ray absorption. The results show that Fe 3O 4 exhibits large orbital moments, as a consequence of the strong Coulomb interactions of Fe 3d electrons. In contrast, orbital moments of Cr in CrO 2 are nearly quenched, revealing that Cr 3d electrons are strongly hybridized with O 2p electrons and more delocalized as compared with those of Fe in Fe 3O 4. Comparing the MCD data with the band structure calculations based on local spin density approximation with on-site Coulomb energy U taken into account, we conclude that to include the on-site Coulomb interactions of 3d electrons is essential for adequately describing the electronic structure of CrO 2 and Fe 3O 4.
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