Abstract
The dynamics of the incommensurate (IC) modulation is investigated for several IC systems near the transition to the normal high temperature phase by means of quadrupolar perturbed NMR spectra using first-order effects. For the special case of the IC phase of RB2ZnCl4 also two-dimensional 87Rb NMR exchange spectra are reported. All results can be described consistently in terms of a static modulation in the IC phase without any indication for “floating” or large scale fluctuations of the modulation wave.
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