Abstract
The phason mode in inclusion compounds is investigated using the double chain model, which consists of two mutually interacting chains. This model generalizes the Frenkel-Kontorova model to a system where both sublattices are deformable. The phase diagram in parameter space contains a region with a zero-frequency phason and a region with a phason gap. In comparison with earlier work, the phase-transition line is not convex. The dynamic structure factor around Bragg and satellite peaks is calculated to find conditions needed to measure the phason mode in experiment.
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