The low-energy electronic structure and the orbital magnetism in NiO
  The orbital and spin moment of the Ni2+ ion in NiO has been calculated within the quasi-atomic approach. The orbital moment of 0.46 mu_B amounts at 0 K, in the magnetically-ordered state, to about 20% of the total moment (2.45 mu_B). For this outcome, being in nice agreement with the recent experimental finding of the orbital moment, taking into account the intra-atomic spin-orbit coupling is indispensable.   PACS: 75.25.+z, 75.10.Dg   Keywords: Crystalline Electric Field, 3d oxides, magnetism, NiO 
R.J. Radwanski and Z. Ropka