  Using TDPAD experiment and local spin density calculations, we have observed
large 4d moments on isolated Mo atoms at substitutional and octahedral
interstitial lattice sites in Yb metal, showing Curie-Weiss local
susceptibility and Korringa like spin relaxation rate. As a surprising feature,
despite strong hybridization with the Yb neighbours, interstitial Mo atoms show
high moment stability with small Kondo temperature. While, magnetism of Mo, at
substitutional site is consistent with Kondo type antiferromagnetic d-sp
exchange interaction, we suggest that moment stability at the interstitial site
is strongly influenced by ferromagnetic polarization of Yb-4f5d band electrons.
