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A discussion is given of the contribution to the M\"ossbauer linewidth in quasi-one-dimensional antiferromagnets with Ising anisotropy due to thermal excitation of moving domain walls ("kinks" or "solitons"). Experimental data on Fe²⁺ chain compounds are presented that confirm the predicted exponential temperature dependence of the linewidth.
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Thiel et al. (1981) studied this question.
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