Evidence for Soliton Modes in the One-Dimensional Ferromagnet CsNi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Evidence for solitons moving along the ferromagnetic chains in CsNi${\mathrm{F}}_{3}$ has been obtained by inelastic neutron scattering. As predicted by Mikeska the scattering is found at low $q$, around zero energy. The soliton activation energy, $8m$, is determined via the temperature and field dependence of the intensities ($m$ is the effective mass of the quasiparticle soliton). At $H=5$ kG we find $\frac{8m}{{k}_{\mathrm{B}}}=27$ K in reasonable agreement with the predicted value, as is the energy width at $q=0.1$.

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