@article { ISI:000295083100018,
	title = {Ferromagnetic Spin Coupling of 2p Impurities in Band Insulators Stabilized by an Intersite Coulomb Interaction: Nitrogen-Doped MgO},
	journal = {PHYSICAL REVIEW LETTERS},
	volume = {107},
	number = {13},
	year = {2011},
	month = {SEP 21},
	pages = {137203},
	abstract = {For a nitrogen dimer in insulating MgO, a ferromagnetic coupling between spin-polarized 2p holes is revealed by calculations based on the density functional theory amended by an on-site Coulomb interaction and corroborated by the Hubbard model. It is shown that the ferromagnetic coupling is facilitated by a T-shaped orbital arrangement of the 2p holes, which is in its turn controlled by an intersite Coulomb interaction due to the directionality of the p orbitals. We thus conjecture that this interaction is an important ingredient of ferromagnetism in band insulators with 2p dopants.},
	issn = {0031-9007},
	doi = {10.1103/PhysRevLett.107.137203},
	author = {Slipukhina, I. and Mavropoulos, Ph. and S. Bl{\"u}gel and Lezaic, M.}
}
