Magnetoresistance in Antiferromagnetic α-Mn Metal

Abstract

The temperature dependence and the magnetic field dependence of the resistivity of polycrystalline α-Mn metal were measured between 1.3 and 20 K in external transverse and longitudinal magnetic fields of up to 100 kOe. The anomalously large coefficient of the T² term in the low-temperature resistivity of α-Mn was found to decrease appreciably for increase in the applied magnetic fields. These results are interpreted in terms of the suppression of spin fluctuations in the antiferromagnetic α-Mn by the high applied fields. The magnetic field dependence of the resistivity, which was corrected for the effect of cyclotron orbital motion, is shown to be a linear function of the applied fields.