SOLITONS IN QUASI-ONE-DIMENSIONAL PI-CONJUGATED ORGANIC FERROMAGNETS

Quasi-one-dimensional pi-conjugated organic polymer ferromagnets are s tudied self-consistently. It is shown that due to the electron-phonon interaction and the Hubbard energy, there exist domain wall solitons d escribing the displacement of lattices along the main chain, and spin solitons describing the localization of spin at side radicals. The spi n soliton corresponds to the highly degenerate band in the middle of t he energy spectra, which gives the main contribution in the high-spin state of the system. (C) 1998 Elsevier Science B.V.