A DFT+U plus Anderson impurity model calculation for CeCo5 gives a magnetic anisotropy energy of 4.8 meV per formula unit that matches experiment and shows the importance of cerium valence fluctuations.
Xie and H, Zhang, Mixed valence nature of the Ce 4fstate in CeCo 5 based on spin-polarized DFT+DMFT calculations, Phys Rev
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Magnetic anisotropy and intermediate valence in CeCo$_5$ ferromagnet
A DFT+U plus Anderson impurity model calculation for CeCo5 gives a magnetic anisotropy energy of 4.8 meV per formula unit that matches experiment and shows the importance of cerium valence fluctuations.