Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-12-09
EPL, 92 (2010) 47006 (www.epljournal.org)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 figures includes, accepted for publication in Eur. Phys. Lett
Scientific paper
10.1209/0295-5075/92/47006
For already a decade the field of diluted magnetic semiconductors (DMS) is one of the hottest. In spite of the great success of material specific Density Functional Theory (DFT) to provide accurately critical Curie temperatures ($T_{C}$) in various III-V based materials, the ultimate search for a unifying model/theory was still an open issue. Many crucial questions were still without answer, as for example: Why, after one decade, does GaMnAs still exhibit the highest $T_{C}$? Is there any intrinsic limitations or any hope to reach room temperature? How to explain in a unique theory the proximity of GaMnAs to the metal-insulator transition, and the change from RKKY couplings in II-VI materials to the double exchange regime in GaMnN? The aim of the present work is to provide this missing theory. We will show that the key parameter is the position of the Mn level acceptor and that GaMnAs has the highest $T_{C}$ among III-V DMS. Our theory (i) provides an overall understanding, (ii) is quantitatively consistent with existing DFT based studies, (iii) able to explain both transport and magnetic properties in a broad variety of DMS and (iv) reproduces the $T_{C}$ obtained from first principle studies for many materials including both GaMnN and GaMnAs. The model also reproduces accurately recent experimental data of the optical conductivity of GaMnAs and predicts those of other materials.
Bouzerar Richard
~Bouzerar Georges
No associations
LandOfFree
Unified picture for diluted magnetic semiconductors 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 Unified picture for diluted magnetic semiconductors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unified picture for diluted magnetic semiconductors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-76985