Effect of conduction band filling on the competition Kondo-magnetism in the Kondo lattice

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.