NDLI: Is High T$_{C}$ Possible in (Ga,Mn)N?: Monte Carlo Simulation vs. Mean Field Approximation

Content Provider	Springer Nature Link
Author	Sato, K. Dederichs, P. H. Katayama Yoshida, H.
Copyright Year	2005
Abstract	The magnetic properties of diluted magnetic semiconductors (DMSs) are calculated from first-principles by mapping the ab initio results on a classical Heisenberg model. By using the Korringa–Kohn–Rostoker coherent potential approximation method within the local density approximation, the electronic structure of (Ga,Mn)N and (Ga,Mn)As is calculated. Effective exchange coupling constants J$_{ij}$s are calculated by using the formula of Liechtenstein et al. (A.~I. Liechtenstein, M. I. Katsnelson, V. P. Antropov, and V. A. Gubanov, 1987, J.~Magn. Magn. Mater. Vol. 67, p. 65). It is found that the range of the exchange interaction in (Ga,Mn)N is very short due to the exponential decay of the impurity wave function in the gap. On the other hand, in (Ga,Mn)As, the interaction is weaker but long ranged because the extended valence hole states mediate the ferromagnetic interaction. Monte Carlo simulations show that the T$_{C}$ values of (Ga,Mn)N are very low since percolation is difficult to achieve for small concentrations and the mean field approximation strongly overestimates T$_{C}$. Even in (Ga,Mn)As the percolation effect is still important.
Starting Page	33
Ending Page	36
Page Count	4
File Format	PDF
ISSN	08961107
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	18
Issue Number	1
e-ISSN	15729605
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	diluted magnetic semiconductor ferromagnetism Curie temperature first-principles calculation Monte Carlo simulation Characterization and Evaluation Materials Condensed Matter Solid State Physics and Spectroscopy
Content Type	Text
Resource Type	Article
Subject	3100/3101 Condensed Matter Physics Electronic, Optical and Magnetic Materials

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