CDW transition and instability in interchain coupled organic ferromagnets with next-nearest neighboring hopping interaction

Considering interchain interaction and the intrachain next-nearest neighbor ing hopping interaction, within the self-consistent-field Hartree-Fock appr oximation, we deal with two neighboring organic ferromagnetic chains. We al so take into account the itineracy of re-electrons, the Hubbard repulsion a nd antiferromagnetic correlation between pi-electrons and side radical elec trons. It is shown that there appear two kinds of CDW successively when the next-nearest neighboring hopping interaction is greater than a critical va lue, which decreases with the interchain coupling. The first CDW is accompa nied with bond-order-wave and the second one with no distortion of lattice. The SDW along the main chain is modulated by the CDW. It is also found tha t the interchain coupling and the next-nearest neighbor hopping integral in stabilizes the ferromagnetic ground states.