Abstract
Thermal unpinning and floating of the incommensurate modulation wave produces in Rb 2ZnCl 4 close to the incommensurate-paraelectric transition T I a partial motional averaging of the splitting between the two edge singularities in the 35Cl nuclear quadrupole resonance spectrum. The mean square phase fluctuations are close to T I proportional to ( T I − T) −2β with β = 0.39 ± 0.04.
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