Abstract
The $^{35}\mathrm{Cl}$ spin-lattice relaxation time in the paraelectric, incommensurate, and commensurate phases of ${\mathrm{Rb}}_{2}$${\mathrm{ZnCl}}_{4}$ was studied, for both the amplitude and the Goldstone modes. The results agree with theoretical predictions. A separate determination of the contributions of the two modes was made. An increase of the phason gap close to the lock-in transition temperature ${T}_{c}$ was observed, which is due to multisoliton lattice effects where the acousticlike branch of the phason excitation spectrum is dominant. The phason gap was calculated.
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