Low temperature resistivity in a nearly half-metallic ferromagnet

Details Low temperature resistivity in a nearly half-metallic ferromagnet Low temperature resistivity in a nearly half-metallic ferromagnet

1998-07-16

arxiv.org/abs/cond-mat/9807244v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.82.4276

We consider electron transport in a nearly half-metallic ferromagnet, in which the minority spin electrons close to the band edge at the Fermi energy are Anderson-localized due to disorder. For the case of spin-flip scattering of the conduction electrons due to the absorption and emission of magnons, the Boltzmann equation is exactly soluble to the linear order. From this solution we calculate the temperature dependence of the resistivity due to single magnon processes at sufficiently low temperature, namely $k_BT\ll D/L^2$, where $L$ is the Anderson localization length and $D$ is the magnon stiffness. And depending on the details of the minority spin density of states at the Fermi level, we find a $T^{1.5}$ or $T^{2}$ scaling behavior for resistivity. Relevance to the doped perovskite manganite systems is discussed.

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