Abstract
Linear and non-linear excitations are investigated theoretically in an easy-plane ferromagnetic chain in an external symmetry-breaking field. As for non-linear modes, the ideal-gas phenomenology is applied to evaluate the thermodynamic and dynamic quantities due to stable sine-Gordon-like solitons that exist for the external field smaller than the critical value, while small-amplitude excitations are treated by the standard spin wave theory with the lowest-order 1/S quantum corrections included. The contributions to the cross sections of polarised neutron scattering from both linear and non-linear modes are evaluated. Some of the results are compared with an experiment on CsNiF3 by Kakurai and co-workers (1984) and the importance of the finite out-of-plane fluctuations that are underestimated in the sine-Gordon approximation is pointed out.
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