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Dissipationless Anomalous Hall Current in the Ferromagnetic Spinel CuCr2Se4-xBrx

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Science  12 Mar 2004:
Vol. 303, Issue 5664, pp. 1647-1649
DOI: 10.1126/science.1094383

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Abstract

In a ferromagnet, an applied electric field E invariably produces an anomalous Hall current JH that flows perpendicular to the plane defined by E and M (the magnetization). For decades, the question of whether JH is dissipationless (independent of the scattering rate) has been debated without experimental resolution. In the ferromagnetic spinel CuCr2Se4–xBrx, the resistivity ρ (at low temperature) may be increased by several decades by varying x (Br) without degrading M. We show that JH/E (normalized per carrier, at 5 kelvin) remains unchanged throughout. In addition to confirming the dissipationless nature of JH, our finding has implications for the generation and study of spin-Hall currents in bulk samples.

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