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Griffiths phase in diluted magnetic semiconductors | | V. M. Galitski
; A. Kaminski
; S. Das Sarma
; | | Date: |
19 Jun 2003 | | Journal: | Phys. Rev. Lett. 92, 177203 (2004) | | Subject: | Materials Science; Disordered Systems and Neural Networks | cond-mat.mtrl-sci cond-mat.dis-nn | | 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. | | Source: | arXiv, cond-mat/0306488 | | Other source: | [GID 652061] pmid15169188 | | Services: | Forum | Review | PDF | Favorites | |
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