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An easy plane magnetic chain in a magnetic field is equivalent to a Sine-Gordon system. At low temperatures and moderate fields the dynamical behaviour of this system can be discussed in terms of magnons and solitons. Solitons are responsible for a zero frequency peak in the longitudinal part of the dynamic structure factor. They are thus observable in neutron scattering experiments.
H.-J. Mikeska (Fri,) studied this question.
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