The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe {1-4}TaS 2: the inelastic regime - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: The large magnetic anisotropy in the layered ferromagnet Fe {1-4}TaS 2 leadsto very sharp reversals of the magnetization $\bf M$ at the coercive field. Wehave exploited this feature to measure the anomalous Hall effect AHE,focussing on the AHE conductivity $\sigma^A {xy}$ in the inelastic regime. Atlow temperature T 5-50 K, $\sigma^A {xy}$ is T-independent, consistent withthe Berry-phase-Karplus-Luttinger theory. Above 50 K, we extract an inelasticAHE conductivity $\sigma^{in} {xy}$ that scales as the square of $\Delta ho$the T dependent part of the resistivity $ ho$. The term $\sigma^{in} {xy}$clarifies the T dependence and sign-reversal of the AHE coefficient R sT. Wediscuss the possible ubiquity of $\sigma^{in} {xy}$ in ferromagnets, and ideasfor interpreting its scaling with $\Delta ho^2$. Measurements of themagnetoresistance MR reveal a rich pattern of behavior vs. T and fieldtilt-angle. We show that the 2 mechanisms, the anisotropic MR effect andfield-suppression of magnons, account for the intricate MR behavior, includingthe bow-tie features caused by the sharp reversals in $\bf M$.



Autor: J. G. Checkelsky, Minhyea Lee, E. Morosan, R. J. Cava, N. P. Ong

Fuente: https://arxiv.org/







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