Abstract:
We theoretically investigated the static magnetic susceptibility in the heavy fermion compounds YbRh(Formula presented.)Si(Formula presented.) and YbIr(Formula presented.)Si(Formula presented.). The molecular field approximation together with the renormalization of the Kondo interaction by the high-energy conduction electron excitations results in the Curie-Weiss law and Van Vleck susceptibility with temperature-dependent Curie and Weiss parameters. © 2014 Springer-Verlag Wien.