Abstract
Experimental studies of the Hall effect in n-type InSb at 77°K have been made in weak transverse magnetic fields (H\\lesssim300 oersteds) for electric fields in the region of the onset of impact ionization. It is known that the Hall coefficient, RH decreases sharply when electron-hole pairs are produced by impact ionization. The observed RH, however, decreases before strong impact ionization sets in and exhibits a minimum. If the magnetic field is sufficiently weak (H\\lesssim100 oersteds), the sign of RH changes from negative (normal for n-type InSb) to positive, with increasing electric field. The anomalous behavior of RH disappears with increasing magnetic field. It is shown experimentally that the observed anomalous Hall effect is related to the transverse and longitudinal asymmetries of potential caused by hole-injection from the anode.
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