Anomalous hall heat current and nernst effect in the CuCr2Se4-xBrx ferromagnet.
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 CuCr2Se4-xBrx. 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 A approximately 34 A(2). Our results are incompatible with some models of the Nernst effect in ferromagnets.
Lee
Wei-Li
WL
Department of Physics, Princeton University, New Jersey 08544, USA.
Watauchi
S
S
Miller
V L
VL
Cava
R J
RJ
Ong
N P
NP