Abstract
Nonlinear magnetic excitations in the Heisenberg magnetic system CsNiF 3 , when an antirerromagnetic interchain interaction is present between two neighboring easy-plane rerromagnetic chains, are studied. Using a two-lattice model and defining coherent states on each site for the two chains the discrete coupled equation for the averages or the spin components are given. In the easy-plane limit it is round that three kinds of static magnetic excitations can exist, depending on the value of the antirerromagnetic interchain exchange interaction J 2 . The inclusion or this antirerromagnetic interchain interaction makes the problem or the nonlinear magnetic excitations appear in a new light
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