Abstract
The results of an on-going study of YbIn 1− x Ag x Cu 4 are presented. YbInCu 4 undergoes a first-order valence transition at 40 K, while YbAgCu 4 is an isostructural heavy Fermion compound. We have succeeded in growing single crystals of these compounds, as well as intermediate alloys, using flux-growth techniques. A smooth evolution from YbInCu 4 to YbAgCu 4 is observed. Results on the influence of sample quality, as well as the effect of other dopants, on the valence transition in YbInCu 4 are also discussed.
Highlights
Since being discovered by Felner and Nowik [1], YblnCu4 has continued to attract attention [2]
A J = 22 Kondo impurity, as described by the Coqblin-Schrieffer model I-5,6]. Both YblnCu4 and YbAgCu4 crystallize in the FCC C15b structure with lattice constants of 7.158 A and 7.083,~, respectively
Single crystals of YbInCu4 were grown by combining stoichiometric ratios of the constituent elements in a I : 1
Summary
Since being discovered by Felner and Nowik [1], YblnCu4 has continued to attract attention [2]. Both YblnCu4 and YbAgCu4 crystallize in the FCC C15b structure with lattice constants of 7.158 A and 7.083 ,~, respectively.
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