Abstract
Investigates states of one deviation from the ground states for a one-dimensional Heisenberg antiferromagnet including the effects of magnetoelastic coupling and easy-axis anisotropy. The method is that of Pushkarov and Pushkarov (1977) for the ferromagnet. It is shown that the long-wavelength excitations may exist in the form of solitary waves that are localised and propagate unchanged, instead of the usual plane-wave magnons. A necessary condition for this to occur is that the exchange interaction, as well as being dependent on the atomic separation, must also be anisotropic.
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