Griffiths phase in diluted magnetic semiconductors
Materials Science
2009-11-10 v2 Disordered Systems and Neural Networks
Abstract
We study the effects of disorder in the vicinity of the ferromagnetic transition in a diluted magnetic semiconductor in the strongly localized regime. We derive an effective polaron Hamiltonian, which leads to the Griffiths phase above the ferromagnetic transition point. The Griffiths-McCoy effects yield non-perturbative contributions to the dynamic susceptibility. We explicitly derive the long-time susceptibility, which has a pseudo-scaling form, with the dynamic critical exponent being expressed through the percolation indices.
Cite
@article{arxiv.cond-mat/0306488,
title = {Griffiths phase in diluted magnetic semiconductors},
author = {Victor Galitski and A. Kaminski and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/0306488},
year = {2009}
}
Comments
4 pages, final version as published