Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The atomic-start description of NiO   We have calculated magnetic properties and the electronic structure of NiO
both in the paramagnetic and in magnetically-ordered state as well as
zero-temperature properties and thermodynamics within the strongly-correlated
crystal-field approach. It is in agreement with a Mott's suggestion that NiO is
an insulator due to strong electron correlations. We have quantified
crystal-field, spin-orbit and magnetic interactions of the Ni2+ ion in NiO. We
have obtained that E_dd >> E_CF(=2.0 eV) >> E_{s-o}(=0.29 eV) > E_mag(=0.07
eV). The orbital moment of 0.54 mu_B amounts at 0 K, in the
magnetically-ordered state, to about 20% of the total moment (2.53 mu_B). Our
studies indicate that it is the highest time to "unquench" orbital magnetic
moment in 3d solid-state physics and the necessity to take always into account
strong intra-atomic correlations among d electrons and the intra-atomic
spin-orbit coupling.
  Pacs: 75.25.+z, 75.10.Dg
  Keywords: Crystalline Electric Field, 3d oxides, magnetism, spin-orbit
coupling NiO

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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas