THE CHARGE-DENSITY-WAVE AND SPIN-DENSITY-WAVE IN INTERCHAIN COUPLED ALTERNATE PI-CONJUGATED ORGANIC FERROMAGNETS

Based on a theoretical model proposed for interchain coupled quasi-one -dimensional organic ferromagnets, the distribution of the charge dens ity and spin density are studied. The next-nearest-neighbouring hoppin g interaction, the strong electron-phonon coupling and electron-electr on interaction are taken into account. It is found that with increasin g of the next-nearest-neighbouring hopping interaction, two kinds of C DW along the main chain appear sequentially. The first CDW is accompan ied by perfect dimerization. The second CDW has a period of four latti ce sites. The SDW is modulated by the CDW. The interchain coupling cau ses the transfers of charge density and spin density between the main chain and side radicals, and reduces the critical next-nearest-neighbo uring hopping at which the second CDW appears.