Griffiths phase in diluted magnetic semiconductors |
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Authors: | Galitski V M Kaminski A Das Sarma S |
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Institution: | Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA. |
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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 nonperturbative contributions to the dynamic susceptibility. We explicitly derive the long-time susceptibility, which has a pseudoscaling form, with the dynamic critical exponent being expressed through the percolation indices. |
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