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The transverse magnetoresistance of stoichiometric and off-stoichiometric polycrystalline samples of the Ni3A1 system has been measured over the temperature range 1.2 & T & 90 K in magnetic fields up to 23 kOe. Negative magnetoresistance was observed in all cases. In samples with Ni concentrations of 75 at. % or greater the magnitude of the magnetoresistance reached a maximum at T = Tc. The data are in qualitative agreement with the theoretical predictions of Chang et al. based on a model of the magnetoresistance of an itinerant ferromagnet, but the observed magnetoresistance is considerably larger than predicted.

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