The rare earth intersublattice exchange coupling has been studied for several Gd-based
antiferromagnetic compounds: GdSi, GdGe, GdSi1.67, GdGe1.67, GdAg2 and GdAu2 by means of the
HFFP (high-field free powder) method. The values of the intersublattice coupling constants obtained by this
method were compared with values derived from a mean field analysis of experimental values of the N??el
temperature, TN, and paramagnetic Curie temperature, ??p. For several of the compounds investigated a
complete moment reversal from the antiparallel to the parallel configuration could be reached in the highfield
regime. The reduced saturation moment of the Gd atoms in the parallel configuration is discussed in
terms of a reduced moment contribution of the valence electrons.
