Electrical Resistivity of Dilute Chromium‐Rich Chromium‐Iron Alloys below 30 °K

Electrical resistivity ϱ of chromium‐iron alloys containing 0.04, 0.08, 0.9, 1.1, 1.3, 1.6, 1.8, and 3.3 at% iron has been measured as a function of temperature T below 30 °K. There are no anomalies in the ϱ vs. T curves for pure chromium and the alloys with 0.04 and 0.08 at% iron. The sample of 0.9 at% iron exhibits a small resistivity minimum at 10 °K. Higher iron contents cause a disappearance of this minimum. The temperature dependence of the electrical resistivity for 1.3, 1.8, and 3.3 at% iron solid solutions is anomalous. The transverse electrical magnetoresistivity of alloys containing 0.9, 2.3, and 3.3 at% iron has been studied at 4.2 °K in magnetic fields up to 12 kOe. The change in the magnetic component of the total magnetoresistivity has been found to be negative for all these samples. The above results have been interpreted as resulting from the localized magnetic moments on the iron atoms which couple weakly with the antiferromagnetic lattice of chromium.