SOLITON PROPAGATION IN A CLASSICAL HEISENBERG CHAIN WITH IMPURITIES

We present numerical studies of soliton propagation in a classical Hei senberg chain which contains a disordered binary-alloy segment having impurities of spin different from that of the host with density p. It is demonstrated that the reflected and the transmitted solitons exhibi t robust features. The transmission coefficient decreases with increas ing soliton energy in the range investigated, and displays a long-tail power-law length dependence with an exponent close to -1. It is also shown that the impurity bonds, which connect neighbouring sites with d ifferent spins, are the elementary scattering units which lead to wave interferences important for the soliton propagation.