Griffiths phase in diluted magnetic semiconductors

Details Griffiths phase in diluted magnetic semiconductors Griffiths phase in diluted magnetic semiconductors

2003-06-19

arxiv.org/abs/cond-mat/0306488v2

Phys. Rev. Lett. 92, 177203 (2004)

Physics

Condensed Matter

Materials Science

4 pages, final version as published

Scientific paper

10.1103/PhysRevLett.92.177203

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.

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