Jr. Iglesias et al., REVISITED DONIACH DIAGRAM - INFLUENCE OF SHORT-RANGE ANTIFERROMAGNETIC CORRELATIONS IN THE KONDO-LATTICE, Physical review. B, Condensed matter, 56(18), 1997, pp. 11820-11826
The Kondo lattice model including nearest-neighbor magnetic exchange i
nteractions is studied here in a mean-field approximation describing b
oth the Kondo state and the intersite magnetic correlations. In the ca
se of antiferromagnetic correlations, our model yields a decrease of t
he Kondo temperature compared to the one-impurity value, giving, there
fore, a ''revisited'' version of the Doniach diagram with a rather fla
t Kondo temperature in the nonmagnetic case, as observed in several ce
rium compounds. Our model shows also that short-range magnetic correla
tions can appear at a temperature clearly larger than the Kondo temper
ature, as observed in compounds such as CeCu6 or CeRu2Si2. [S0163-1829
(97)04642-0].