Q-Dependence of the Soliton Response in CsNiF3 at T = 10K and H = 5 kg
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Recently the first direct experimental evidence of solitons in the one-dimensional (I-D) ferromagnetic chain system CsNiF3 with easy plane anisotropy was reported by Kjems and Steiner . They observed a quasi-elastic component in the dynamic structure factor which was interpreted within the theoretical framework developed by Mikeska  for a I-D XY-ferromagnet in an applied field. Mikeska had showed that the spin dynamics of such systems are described by the Sine-Gordon equation and this enabled him to predict explicitly the characteristic temperature and field dependence of the scattering due to non-linear modes -such as kinks or solitons. The predictions agreed very well with the results of the first neutron scattering experiment . Another important prediction of the theory is the wavevector dependence of the energy width and of the integrated quasielastic intensity. This has been measured in a subsequent experiment and the results are reported here.
KeywordsBackground Subtraction Energy Width Spin Diffusion Direct Experimental Evidence Condense Matter System
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