Experimental results for the susceptibility, specific heat, 4f occupation number, Hall effect and magnetoresistance for single crystals of YbAl3 show that, in addition to the Kondo energy scale kBTK 670K, there is a low temperature scale Tcoh<50K for the onset of coherence. Furthermore the crossover from the low temperature Fermi liquid regime to the high temperature local moment regime is slower than predicted by the Anderson impurity model. These effects may reflect the behavior of the Anderson Lattice in the limit of low conduction electron density.
@article{arxiv.cond-mat/0107638,
title = {Two energy scales and slow crossover in YbAl3},
author = {J. M. Lawrence and T. Ebihara and P. S. Riseborough and C. H. Booth and M. F. Hundley and P. G. Pagliuso and J. L. Sarrao and J. D. Thompson and M. H. Jung and A. H. Lacerda and G. H. Kwei},
journal= {arXiv preprint arXiv:cond-mat/0107638},
year = {2009}
}