A Monte Carlo Study of Critical Properties of Strongly Diluted Magnetic Semiconductor (Ga,Mn)As
P. Tomczaka, H.T. Diepb, P. Jabłońskia and H. Puszkarskia
a Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
b Laboratoire de Physique Theorique et Modelisation, Universite de Cergy-Pontoise, CNRS, UMR 8089 2, Avenue Adolphe Chauvin, 95302 Cergy-Pontoise Cedex, France
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Within a Monte Carlo technique we examine critical properties of diluted bulk magnetic semiconductor (Ga,Mn)As modeled by a strongly diluted ferromagnetic Heisenberg spin-5/2 system on a face centered cubic lattice. We assumed that 5% of Ga atoms is substituted by Mn atoms and the interaction between them is of the RKKY-type. The considered system is randomly quenched and a double average was performed: firstly, over the Boltzmann probability distribution and secondly - over 2048 configurations related to the quenched disorder. We estimated the critical temperature: Tc=97±6 K, which is in agreement with the experiment.

DOI: 10.12693/APhysPolA.133.514
PACS numbers: 75.50.Pp, 75.10.Nr, 75.30.Hx