Abstract
We present experimental results which show clearly the existence and the role played by nonlinear excitations in the quasi-1d compounds TMMC and CsCoCl 3 (solitons) and quasi-2d compounds BaM 2 (XO 4 ) 2 (M = Co, Ni; X = P, As). The role of the collisions between solitons and magnons and the applicability of the Kosterlitz-Thouless theory are discussed in the light of new inelastic neutron scattering experiments.
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