Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-11-02
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 14 figures
Scientific paper
10.1103/PhysRevB.63.165206
The properties of diluted Ga$_{1-x}$Mn$_x$As are calculated for a wide range of Mn concentrations within the local spin density approximation of density functional theory. M\"ulliken population analyses and orbital-resolved densities of states show that the configuration of Mn in GaAs is compatible with either 3d$^5$ or 3d$^6$, however the occupation is not integer due to the large $p$-$d$ hybridization between the Mn $d$ states and the valence band of GaAs. The spin splitting of the conduction band of GaAs has a mean field-like linear variation with the Mn concentration and indicates ferromagnetic coupling with the Mn ions. In contrast the valence band is antiferromagnetically coupled with the Mn impurities and the spin splitting is not linearly dependent on the Mn concentration. This suggests that the mean field approximation breaks down in the case of Mn-doped GaAs and corrections due to multiple scattering must be considered. We calculate these corrections within a simple free electron model and find good agreement with our {\it ab initio} results if a large exchange constant ($N\beta=-4.5$eV) is assumed.
Hill Nicola A.
Ordejon Pablo
Sanvito Stefano
No associations
LandOfFree
First principles study of the origin and nature of ferromagnetism in (Ga,Mn)As does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with First principles study of the origin and nature of ferromagnetism in (Ga,Mn)As, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and First principles study of the origin and nature of ferromagnetism in (Ga,Mn)As will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-453048