The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime

Details The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime

2007-08-08

arxiv.org/abs/0708.1143v1

Phys. Rev. B 77, 014433 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 11 figures

Scientific paper

10.1103/PhysRevB.77.014433

The large magnetic anisotropy in the layered ferromagnet Fe_{1/4}TaS_2 leads to very sharp reversals of the magnetization $\bf M$ at the coercive field. We have exploited this feature to measure the anomalous Hall effect (AHE), focussing on the AHE conductivity $\sigma^A_{xy}$ in the inelastic regime. At low temperature T (5-50 K), $\sigma^A_{xy}$ is T-independent, consistent with the Berry-phase/Karplus-Luttinger theory. Above 50 K, we extract an inelastic AHE conductivity $\sigma^{in}_{xy}$ that scales as the square of $\Delta\rho$ (the T dependent part of the resistivity $\rho$). The term $\sigma^{in}_{xy}$ clarifies the T dependence and sign-reversal of the AHE coefficient R_s(T). We discuss the possible ubiquity of $\sigma^{in}_{xy}$ in ferromagnets, and ideas for interpreting its scaling with $(\Delta\rho)^2$. Measurements of the magnetoresistance (MR) reveal a rich pattern of behavior vs. T and field tilt-angle. We show that the 2 mechanisms, the anisotropic MR effect and field-suppression of magnons, account for the intricate MR behavior, including the bow-tie features caused by the sharp reversals in $\bf M$.

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