Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations

Details Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations

2008-08-14

arxiv.org/abs/0808.1951v2

Physics

Condensed Matter

Materials Science

11 pages, 6 figures, submitted to Phys. Rev. B

Scientific paper

The first-principles full-potential linearized augmented plane-wave method based on density functional theory is used to investigate electronic structure and magnetic properties of hypothetical binary compounds of I$^{A}$ subgroup elements with nitrogen (LiN, NaN, KN and RbN) in assumed three types of cristalline structure (rock salt, wurtzite and zinc-blende). We find that, due to the spin polarized \textit{p} orbitas of N, all four compounds are half-metallic ferromagnets with wide energy bandgaps (up to 2.0 eV). The calculated total magnetic moment in all investigated compounds for all three types of crystal structure is exactly 2.00 $\mu_{\text{B}}$ per formula unit. The predicted half-metallicity is robust with respect to lattice-constant contraction. In all the cases ferromagnetic phase is energetically favored with respect to the paramagnetic one. The mechanism leading to half-metallic ferromagnetism and synthesis possibilities are discussed.

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