تقرير
Theory of ferromagnetism driven by superexchange in dilute magnetic semiconductors
| العنوان: | Theory of ferromagnetism driven by superexchange in dilute magnetic semiconductors |
|---|---|
| المؤلفون: | Simserides, C., Majewski, J. A., Trohidou, K. N., Dietl, T. |
| المصدر: | European Physical Journal Web of Conferences 75, 01003 (2014) |
| سنة النشر: | 2013 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Magnetic properties of Ga$_{1-x}$Mn$_x$N are studied theoretically by employing a tight binding approach to determine exchange integrals $J_{ij}$ characterizing the coupling between Mn spin pairs located at distances $R_{ij}$ up to the 16th cation coordination sphere in zinc-blende GaN. It is shown that for a set of experimentally determined input parameters there are no itinerant carriers and the coupling between localized Mn$^{3+}$ spins in GaN proceeds via superexchange that is ferromagnetic for all explored $R_{ij}$ values. Extensive Monte Carlo simulations serve to evaluate the magnitudes of Curie temperature $T_\mathrm{C}$ by the cumulant crossing method. The theoretical values of $T_\mathrm{C}(x)$ are in quantitative agreement with the experimental data that are available for Ga$_{1-x}$Mn$_x$N with randomly distributed Mn$^{3+}$ ions with the concentrations $0.01 \leq x \leq 0.1$. Comment: 4.5 pages 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/epjconf/20147501003 |
| URL الوصول: | http://arxiv.org/abs/1308.4517 |
| رقم الأكسشن: | edsarx.1308.4517 |
| قاعدة البيانات: | arXiv |
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