Magnetic hyperfine fields on 111Cd in the Pd1+xMnSb heusler alloys

The time-differential perturbed angular correlation technique has been used to measure the magnetic hyperfine fields (mhf) acting on ¹¹¹Cd impurity on the series of alloys Pd_1+xMnSb with 0 ? x ? 1. We observe three diffrent mhf's which for small values of x are of the order of +250, ?250 and ?150 kOe, decreasing slowly for larger values of x. These three fields are associated with ¹¹¹Cd occupying the sites of Mn, Sb and Pd, respectively. In addition, magnetization measurements on three of the allows (x = 0, 0.4 and 0.8) gave magnetic moments on the Mn atoms of 3.88 ± 0.08, 4.18 ± 0.08, (4.14 ± 0.08)_μB and Curie temperatures of 470 ± 2,422 ± 5 and (288 ± 2) K, respectively. Our results together with the existing data for mhf's on various 5sp elements in the Pd₂MnSb Heusler alloy are compared with the Blandin-Campbell model and show an agreement which is only qualitative.