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28 March 2024
 
  » pubmed » pmid15169188

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Griffiths phase in diluted magnetic semiconductors
V M Galitski ; A Kaminski ; S Das Sarma ;
Date 30 Apr 2004
Journal Phys Rev Lett, 92 (17), 177203
AbstractWe 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.
Source PubMed, pmid15169188
Other source [GID 652061] cond-mat/0306488
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