87Rb NMR Study of the incommensurate phase transition in Rb2ZnCl4

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Abstract
The temperature dependence of the 87Rb quadrupole perturbed NMR spectra and spin-lattice relaxation rates has been measured in the high temperature paraelectric (P), the intermediate incommensurate (I) and the low temperature commensurate (C) ferroelectric phase. The obtained data show the presence of commensurate domains separated by broad incommensurate domain walls in the I phase. The spin-lattice relaxation rates of the 87Rb 1/2 → -1/2 transitions are dominated by the soft mode in the P phase whereas an anomalously strong, nearly temperature independent contribution dominates T−1 1 in the I phase. This contribution which disappears on going to the ferroelectric C phase seems to represent the first direct observation of a phason in an incommensurate ferroelectric.

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