Abstract
The intermediate phase of the intermetallic alloy CsPb is shown to be a plastic crystal characterized by jump reorientations of ${\mathrm{Cs}}_{4}$${\mathrm{Pb}}_{4}$ structural units. The wave-vector variation of elastic and quasielastic intensities is well reproduced by a simple model of independent structural units jumping between the four orientations observed in the crystal at room temperature. This represents the first observation of a plastic-crystal phase in a metal alloy.
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