Ferromagnetic and random spin ordering in diluted magnetic semiconductors

Details Ferromagnetic and random spin ordering in diluted magnetic semiconductors Ferromagnetic and random spin ordering in diluted magnetic semiconductors

2004-05-20

arxiv.org/abs/cond-mat/0405467v2

Phys. Rev. B 70, 115216 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, 2 figures, a reference added

Scientific paper

10.1103/PhysRevB.70.115216

In a diluted magnetic semiconductor system, the exchange interaction between magnetic impurities has two independent components: a direct antiferromagnetic interaction and a ferromagnetic interaction mediated by charge carriers. Depending on the system parameters, the ground state of the system may be ordered either ferromagnetically or randomly. In this paper we use percolation theory to find the ferromagnetic transition temperature and the location of the quantum critical point separating the ferromagnetic phase and a valence bond glass phase.

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