Abstract
Based on a theoretical model proposed for quasi-one-dimensional organic polymer ferromagnets, the next-nearest neighbor hopping interactions of π-electrons are considered. Allowing for full lattice relaxation, a set of self-consistent equations is established to study the system. The spin-density-wave (SDW) and the possible ferromagnetic ground state of the system are investigated in detail. It is found that the next-nearest neighbor hopping interactions will make the SDW stronger and consequently make the ferromagnetic state more stable as compared with the nonmagnetic reference state.
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