Magnetic hyperfine field at \textit{s-p} impurities on Laves phase compounds

Abstract

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}/μ_{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.

Presented in ICM2009 in Karlsruhe, Germany