(1) Chemistry Division, Bhabha Atomic Research Centre, Bombay 400 085, India
(2) Ames Laboratory USDOE and Department of Physics, Iowa State University, Ames, Iowa 50011, USA
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. p-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 p are observed in the region of TsubN 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 TsubN, as a function of the rise in Al content, in the light of the infrared reflectivity data reported earlier on these samples.