Abstract
It is shown that resonant impurity scattering of a free-electron gas can produce an anomalous Hall effect. The resonance temporarily captures an electron being scattering; if a frame of reference rotating with half the cyclotron frequency is used to represent the magnetic field the scattering pattern appears to be skewed round because of the delay in re-emission. This gives rise to a transverse momentum transfer in the scattering. The anomalous Hall effect depends strongly both in magnitude and sign on the phase shifts and their energy derivatives. A very rough calculation for iron dissolved in liquid germanium suggests that this effect may be of the correct order of magnitude to explain some experimental results, although the answer seems a little low.

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