Employing the Dyson-Maleev transformation and the coherent state ansatz, two partial differential equations of motion from the Hamiltonian of the f.c.c. antiferromagnet CeAs are obtained. By using the multiple scalar method and the long-wavelength approximation, these equations are reduced to a nonlinear Schrodinger equation. The single soliton solution is obtained by using the inverse scattering transformation. For the single soliton bound state, the energy and the spatial configurations of the spin are given.
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