Abstract
A new polarimetric method for measuring the optical activity (OA) and linear birefringence (LB) of crystals is applied to the study of the gyration component g33 in the incommensurate (INC) {N(CH3)4}2ZnCl4. The OA is found to be non-zero in the INC phase, and, as a result of precursor effect, in the parent phase up to 5 K above Ti. The divergence observed in the temperature dependence of the eigenwave ellipticity at the LB inversion point can be explained by the influence of structural inhomogeneities on the INC modulation. The results obtained for the OA and LB are, to a certain degree, similar to those of the previous studies and contradict the views that the OA must be symmetry restricted in the INC compounds.
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