Spin clustering and ferromagnetic couplings in a dilute magnetic semiconductor

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dc.creatorSingh, Avinash
dc.date2003-07-01
dc.date.accessioned2026-07-07T02:52:08Z
dc.date.available2026-07-07T02:52:08Z
dc.descriptionFerromagnetic couplings in spin clusters are shown to be strongly enhanced compared to those for an ordered impurity arrangement, even for the same spin separation and hole doping. The consequent energy-enhancement of the cluster-localized spin-wave modes indicates a potentially significant role of positional Mn disorder in enhancing $T_{\rm C}$. Within a simple model involving two spin-excitation energy scales corresponding to weakly and strongly coupled spins, the temperature dependence of magnetization is found to be in good agreement with the SQUID magnetization data for Ga$_{1-x}$Mn$_x$As.
dc.description4 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0307009
dc.identifierhttp://arxiv.org/abs/cond-mat/0307009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21725
dc.subjectStrongly Correlated Electrons
dc.titleSpin clustering and ferromagnetic couplings in a dilute magnetic semiconductor
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