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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 | 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. | Source: | PubMed, pmid15169188 | Other source: | [GID 652061] cond-mat/0306488 | Services: | Forum | Review | Favorites |
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