Amplitude-fluctuation effects on magnetic-resonance line shape and soliton density in incommensurate systems

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Abstract
The magnetic-resonance line shape in one-dimensionally modulated structurally incommensurate systems has been evaluated for the case of a multisoliton lattice taking into account both phase and amplitude variations in space. Amplitude variations significantly affect the NMR line shape outside the "plane-wave" regime. A comparison is made between the temperature dependence of the average incommensurate wave vector and the soliton density in the constant-amplitude approximation and in the case when amplitude variations are taken into account.