Abstract
The present state of theoretical and experimental magnetic resonance investigations of structurally incommensurate systems is reviewed. The magnetic resonance lineshapes and the temperature and frequency dependences of the spin-lattice relaxation rates are evaluated in the plane wave and multisoliton limits. In contrast to translationally periodic systems, the spin-lattice relaxation rate is shown to vary over the incommensurate resonance line and is determined by phason and amplitudon fluctuations. The variation of the relaxation rate over the incommensurate line allows for a separate determination of the amplitudon and phason contributions as well as a discrimination between direct and Raman processes. The results further demonstrate that the soliton width is large as compared to the intersoliton spacing over most of the incommensurate phase.
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