Substitutions of Cu by Ga in YbCu5 stabilize the hexagonal CaCu5 structure and cause a crossover from a divalent behavior of the Yb ion in YbCu5 to an almost 3+ state of Yb in YbCu3Ga2. This gain of magnetism is accompanied by a noticeable enhancement of the electronic contribution to the speci6c heat. External pressure transforms those compounds, exhibiting intermediate valence, to a state which is best described in terms of the Kondo lattice model.
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