The strength of the intersublattice GdCo exchange-coupling parameter (AGdCo) derived from
different methods has been reported for the Gd(Co1-xBx)5 intermetallics. As the B content increases, a
tendency of ARCo to decrease is found. This variation is compared with that observed for the Co magnetic
moment. The results are related to the influence of the 3d-p hybridization on the 4f-3d coupling and
discussed in terms of the magnetic valence concept. These discussions are extended to other GdCoB
systems. ?? 1995.
