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YbIn1−xAgxCu4: Crossover from first-order valence transition to heavy Fermion behavior


The results of an on-going study of YbIn1-xAgxCu4 are presented. YbInCu4 undergoes a first-order valence transition at 40 K, while YbAgCu4 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 YbInCu4 to YbAgCu4 is observed. Results on the influence of sample quality, as well as the effect of other dopants, on the valence transition in YbInCu4 are also discussed.

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