We calculate the magnetoresistance and magnetothermopower of magnetic granular solids. Contrary to previous theories of the giant magnetoresistance (GMR), we demonstrate that the unfilled d bands of magnetic grains play an essential role in the transport properties of these systems. Our results relate GMR and magnetothermopower to microscopic and geometric quantities, and provide a natural explanation for many experimentally observed features, such as the (M/Mₛ{)}²$ dependence of the GMR, the giant magnetothermopower and its 1/{ρ} scaling behavior, and the absence of negative GMR in rare-earth--nonmagnetic structures.
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Chang et al. (1993) studied this question.
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