We present a mean-field analysis of the competition between magnetic order
and Kondo effect in a Kondo-lattice model usually employed to discuss prope
rties of certain cerium compounds. A phase diagram is obtained showing an a
ntiferromagnetic phase and a Kondo-compensated regime. in agreement with th
e Doniach diagram. A general discussion of the mean-field approach is also
presented. (C) 2001 Elsevier Science BN, All rights reserved.