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Mott relation for anomalous Hall and Nernst effects in Ga1-xMnxAs ferromagnetic semiconductors
Yong Pu1, Daichi Chiba, Fumihiro Matsukura
1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.
Abstract:
The Mott relation between the electrical and thermoelectric transport coefficients normally holds for phenomena involving scattering. However, the anomalous Hall effect (AHE) in ferromagnets may arise from intrinsic spin-orbit interaction. In this work, we have simultaneously measured AHE and the anomalous Nernst effect (ANE) in Ga1-xMnxAs ferromagnetic semiconductor films, and observed an exceptionally large ANE at zero magnetic field. We further show that AHE and ANE share a common origin and demonstrate the validity of the Mott relation for the anomalous transport phenomena.
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