Correlated Mean Field Ansatz for the Kondo Necklace
Condensed Matter
2013-07-22 v1
Abstract
We study the ground state phase diagram of the pseudospin model introduced by Doniach to describe the essential physics of Kondo lattices. We use variational trial states which augment the usual mean field solution by incorporating various intersite correlations. A composite spin correlation describing the antiparallel alignment of fluctuating triplets is found to be particularly favourable for large Kondo couplings. With this trial state, the magnetic--to--Kondo transition is suppressed and the strong coupling ground state is ordered with strongly reduced moments. The relevance of the findings is discussed.
Keywords
Cite
@article{arxiv.cond-mat/9308015,
title = {Correlated Mean Field Ansatz for the Kondo Necklace},
author = {H. Y. Kee and P. Fazekas},
journal= {arXiv preprint arXiv:cond-mat/9308015},
year = {2013}
}
Comments
22 pages (4 figures upon request from [email protected]), LATEX, submitted for publication, IC-93-248