Abstract
Abstract The role of the multicomponent character of the order parameter is investigated for the interplay between classical and non-classical behavior below structural phase transitions. The microscopic origin of non-universal parameters in our approach is outlined briefly. It is shown that the symmetry-breaking effect of the phase transition which reduces the degeneracy of the soft-mode frequency of the high-temperature phase can give rise to strong correlations between transverse fluctuations and longitudinal excitations below Tc for all T < Tc along the coexistence curve.
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