### Magnetism from $2p$ States in Alkaline Earth Monoxides: Trends with Varying N Impurity ConcentrationMagnetism from $2p$ States in Alkaline Earth Monoxides: Trends with Varying N Impurity Concentration

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 Author Pardo, V. ♦ Pickett, W. E. Source arXiv.org Content type Text File Format PDF Date of Submission 2008-08-06 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Condensed Matter - Strongly Correlated Electrons ♦ physics:cond-mat Abstract $2p$-based magnetic moments and magnetic coupling are studied with density functional based methods for substitutional N in the alkaline earth monoxide series MgO, CaO, SrO, BaO. The hole is rather strongly localized near the N$^{2-}$ ion, being somewhat more so when strong on-site interactions are included in the calculations. Strong magnetic coupling is obtained in the itinerant electron limit but decreases strongly in the localized limit in which the Coulomb repulsion within the N $2p$ shell (U) is much greater than the N $2p$ impurity bandwidth (W). We find that this limit is appropriate for realistic N concentrations. Ordering on a simple cubic sublattice may maximize the magnetic coupling due to its high directionality. Description Reference: Phys. Rev. B 78, 134427 (2008) Educational Use Research Learning Resource Type Article Page Count 6