Susceptibility measurements on the valence fluctuation system (Yb,Sc)Al3

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Abstract
The susceptibility of YbxSc1−xAl3 (Cu3Au‐type structure) for x=0.1, 0.2, 0.5 and 1.0 has been measured from 4.2 to 700 K. In contrast to Ce‐Th alloys, the addition of a smaller atom, Sc, to YbAl3 favors the configuration with a larger atomic volume, Yb2+. The susceptibility per mole Yb exhibits a broad maximum which shifts to lower temperatures with increasing x. Room temperature lattice constant measurements indicate that the valance increases gradually from ∼2.7 at x=0.1 to ∼2.9 at x=1.0. Fitting our data to the resonant level‐type model of Sales, we find that the width of the resonant level ‐ decreases dramatically with increasing x. All the data approximately satisfies a scaling relationship.