${}^{87}{Rb}$ Spin-Lattice Relaxation in the Incommensurable Phase of ${Rb}_{2}$ Zn ${Cl}_{4}$

The contribution of phason and amplitudon excitations to the spin-lattice relaxation rate in structurally incommensurable (

I

) systems as well as the NMR line shapes in these systems have been evaluated and compared with the

{}^{87}{Rb}

NMR data for

{Rb}_{2}

{Cl}_{4}

. The presence of a strong, temperature-independent relaxation mechanism, which disappears below the "lockin" transition, demonstrates that in the

I

phase of

{Rb}_{2}

{Cl}_{4}

the spin-lattice relaxation rate is dominated by phasons.

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Rb87Spin-Lattice Relaxation in the Incommensurable Phase ofRb2ZnCl4