Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-21
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 6 figures
Scientific paper
Electron correlation effects in the half-metallic ferromagnet NiMnSb are investigated within a combined density functional and many-body approach. Starting from a realistic multi-orbital Hubbard-model including Mn and Ni-d orbitals, the many-body problem is addressed via the Variational Cluster Approach. The density of states obtained in the calculation shows a strong spectral weight transfer towards the Fermi level in the occupied conducting majority spin channel with respect to the uncorrelated case, as well as states with vanishing quasiparticle weight in the minority spin gap. Although the two features produce competing effects, the overall outcome is a strong reduction of the spin polarisation at the Fermi level with respect to the uncorrelated case. This result emphasizes the importance of correlation in this material.
Allmaier H.
Arrigoni Enrico
Chioncel Liviu
Katsnelson Mikhail I.
Lichtenstein Alexander I.
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