Possible magnetic-field-induced voltage and thermopower in diluted magnetic semiconductors

Details Possible magnetic-field-induced voltage and thermopower in diluted magnetic semiconductors Possible magnetic-field-induced voltage and thermopower in diluted magnetic semiconductors

2006-05-01

arxiv.org/abs/cond-mat/0605043v1

Physics

Condensed Matter

Materials Science

6 pages revtex, 5 figures

Scientific paper

10.1103/PhysRevB.74.014419

In diluted magnetic semiconductors, the carrier concentration and the magnetization of local moments are strongly coupled, since the magnetic interaction is mediated by the carriers. It is predicted that this coupling leads to an electric polarization due to an applied magnetic-field gradient and to the appearance of a magnetic-field-dependent voltage. An expression for this voltage is derived within Landau theory and its magnitude is estimated for (Ga,Mn)As. Furthermore, a large contribution to the thermopower based on the same mechanism is predicted. The role of fluctuations is also discussed. These predictions hold both if the magnetization is uniform and if it shows stripe-like modulations, which are possible at lower temperatures.

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