A primary model investigation of organic ferromagnets

By using a simple tight-binding model, we study the magnetic properties of the substituted polyacetylene with lateral radicals R*. It includes the eff ects of pi electron hopping between the alternate radicals and associated c arbons on the bond order wave along the polyacetylene chain, the formation of charge density wave, and the effects of next-nearest-neighbor hoppings a nd electronic interactions. Our results are compared with and used to under stand the ab initio calculations on the organic ferromagnet (C3H3)(n), subs tituted polyacetylene with lateral radical R* as the organic segment CH2.