Step-Wise Dielectric Anomaly and Discommensurations in the Incommensurate S_<1-x>O_xC (ND_2)_2

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Complex dielectric constants c', c" were measured in #-urea-doped #-thiourea,where linear chains of hydrogen bonds along the modulation direction were affectedby doped molecules. The step-wise oscillatory changes were observed on very slowcooling and heating runs (0.5mK/min). The discontinuous jumps were observedmore clearly on the heating run rather than on the cooling run. These interesting newfeatures are closely related to discommensurations due to the impurity pinning ofmodulation waves and to the extraordinarily slow relaxation process of adjacentmolecular re-arrangement to equilibrium in the incommensurate phase.
1988-07-15