Abstract:
The electrical resistance of antiferromagnetic alloys is calculated in the coherent potential approximation. It is shown that if the Fermi energy is localised near the gap in the electron density of states, the electrical resistance can increase with increasing magnetisation of the sublattices. Experimental studies previously conducted on Cr-Pt alloys show that the resistance anomaly increases with increasing impurity concentration. For Ni-Mn alloys of equiatomic composition, a significant increase in electrical resistance (over 80%) was previously observed experimentally during the transition to the AFM state. Thus, the theory we propose provides a qualitative explanation for the observed temperature and concentration anomalies in the electrical resistance of AFM alloys.
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