Elementary Excitations in Quantum Antiferromagnetic Chains: Dyons,   Spinons and Breathers
  Considering experimental results obtained on three prototype compounds, TMMC, CsCoCl3 (or CsCoBr3) and Cu Benzoate, we discuss the importance of non-linear excitations in the physics of quantum (and classical) antiferromagnetic spin chains. 
T. Asano, H. Nojiri, Y. Inagaki, Y. Ajiro, L.P. Regnault and J.P.   Boucher