Evidence for Soliton Modes in the One-Dimensional Ferromagnet CsNi F 3

TLDR: In this paper, the activation energy of the quasiparticle soliton was determined via the temperature and field dependence of the intensities of the soliton's intensities, and it was shown that at the cost of a higher activation energy, the solitons can move along the ferromagnetic chains in CsNi${\mathrm{F}}_{3}$.

Abstract: 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 $q=0.1$.