Anomalous-Hall heat current and Nernst effect in the ferromagnet CuCr_2Se_{4-x}Br_x

Details Anomalous-Hall heat current and Nernst effect in the ferromagnet CuCr_2Se_{4-x}Br_x Anomalous-Hall heat current and Nernst effect in the ferromagnet CuCr_2Se_{4-x}Br_x

2004-07-29

arxiv.org/abs/cond-mat/0407765v2

Phys. Rev. Lett. 93, 226601 (2004)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures, revision with publication info

Scientific paper

10.1103/PhysRevLett.93.226601

In a ferromagnet, an anomalous-Hall heat current, given by the off-diagonal Peltier term $\alpha_{xy}$, accompanies the anomalous Hall current. By combining Nernst, thermopower and Hall experiments, we have measured how $\alpha_{xy}$ varies with hole density and lifetime $\tau$ in $\rm CuCr_2Se_{4-x}Br_x$. At low temperatures $T$, we find that $\alpha_{xy}$ is independent of $\tau$, consistent with anomalous-velocity theories. Its magnitude is fixed by a microscopic geometric area ${\cal A}\sim 34 \mathrm{\AA}^2$. Our results are incompatible with some models of the Nernst effect in ferromagnets.

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