Recent experimental results for the magnetic hyperfine field B_{ \rm hf} at the nuclei of \textit{ s-p} impurities such as ${ }^{ 119}$Sn in intermetallic Laves phases RM_2 (R = Gd, Tb, Dy, Ho, Er; M = Fe, Co) and ${ }^{ 111}$Cd in RCo_{ 2}, the impurity occupying a $R$ site indicate that the ratio B_{ \rm hf}/\mu_{ 3d} exhibits different behavior when one goes from RFe_2 to RCo_2. In this work, we calculate these local moments and the magnetic hyperfine fields. In our model, B_{ \rm hf} has two contributions: one arising from the $R$ ions, and the other arising from magnetic 3d-elements; these separate contributions allow the identification of the origin of different behavior of the ratio mentioned above. For { }^{ 111}Cd in RCo_2 we present also the contributions for B_{ \rm hf} in the light rare earth Pr, Nd, Pm, Sm compounds. For the sake of comparison we apply also the model to { }^{ 111}Cd diluted in RNi_2. Our self-consistent magnetic hyperfine field results are in good agreement with those recent experimental data.
Categories: cond-mat.str-el