Transport and thermodynamical properties of Yb(Cu,Al)5compounds

Abstract
Substitutions for Cu with Al in YbCu5 stabilize the hexagonal CaCu5 structure and cause a crossover from a divalent behaviour of the Yb ion in YbCu5 to a stable integer 3+ behaviour of Yb in YbCu3Al2. Additionally, this substitution is responsible for the appearance of long-range magnetic order of a certain antiferromagnetic type in the compound YbCu3Al2 below 1.9 K.

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