The variation of the Kondo effect and its competition with magnetism are di
scussed here as a function of the number of conduction electrons, within a
Kondo lattice model which rakes into account both the intra-site Kondo exch
ange and an inter-site antiferromagnetic exchange interaction. By using a m
ean-field approximation we show that the local Kondo effect is decreased or
even suppressed away from half-filling, as well as by antiferromagnetic co
rrelations between neighbours. as seen in our calculation of the magnetic s
usceptibility. (C) 2000 Elsevier Science B.V. All rights reserved.