Effect of small additions of vanadium on the electrical resistivity of Cr-0.5 at% Ir

Abstract

The electrical resistivity (ϱ) data as a function of temperature is reported for the alloys (Cr 99.5Ir 0.5) 100− x V itx containing vanadium compositions x = 0.0, 0.1, 0.2 and 0.3. The progressive addition of vanadium to the Cr-0.5 at% Ir host causes a drop in the Néel temperature and a sharp reduction in the size of the ρ-anomaly corresponding to the Néel temperature. The ϱ( T) curves of the vanadium-containing alloys stage a cross-over vis-a-vis that of the host at about 280 K. The values of the T NI, the paramagnetic-to-incommensurate SDW antiferromagnetic transition temperature, when plotted against the electron-to-atom ratio do not give any evidence of a depression of T N due to impurity scattering. The results are discussed.