The sf and sd exchange constants as well as the effective mass of carriers for Gd$_{x}$Y$_{1-x}$Fe$_{3}$ types of compounds are determined on the basis of the theory of indirect exchange and experimental values of hyperfine fields, the Curie temperature, and the resistivity. It is shown that agreement with experiment may be improved if it is supposed that exchange reactions in these complexes are realized not only by means of conductivity electrons, but also by means of d-type collective electrons.
Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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