REVISITED DONIACH DIAGRAM - INFLUENCE OF SHORT-RANGE ANTIFERROMAGNETIC CORRELATIONS IN THE KONDO-LATTICE

Citation
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
Citations number
44
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
56
Issue
18
Year of publication
1997
Pages
11820 - 11826
Database
ISI
SICI code
0163-1829(1997)56:18<11820:RDD-IO>2.0.ZU;2-L
Abstract
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].