Abstract
Using the self-consistent phonon theory and the renormalization-group theory we have studied the critical behavior of systems with incommensurately modulated structure and especially the width of the critical region near structural phase transitions, where nonclassical critical exponents are valid. The critical region can be large if the dispersion of the soft mode is small (very ``soft'' mode) and/or if the anharmonic interaction constant is large. Taking parameters appropriate to rubidium tetrachloro zincate, rubidium tetrabromo zincate, and bis(4-chlorophenyl)sulfone we obtain results which are in good agreement with the experimental data.
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