ON THE SIZE OF THE ELECTRICAL-RESISTIVITY ANOMALY AT THE NEEL TRANSITION OF DILUTE CR-AL ALLOYS

An attempt has been made to resolve the question of the non-observation of characteristic anomalies in the electrical resistivity (p) corresponding to the Neel temperature of CrAl alloys in the intermediate concentration range rho -T studies are reported for the first time, on single-crystal samples containing 0. 23, 0. 52, 1. 02, 1. 41, 1. 91, 2. 99 and 4. 53 at. % Al. Anomalies in rho are observed in the region of T//N for all these alloys although the size of the anomaly is small in the case of Cr-1. 91 at. % Al and Cr-2. 99 at. % Al. Comments are made on the nature of the magnetic phase appearing below T//N, as a function of the rise in Al content, in the light of the infrared reflectivity data reported earlier on these samples.