Competition between e-p coupling and e-e interaction in quasi-one-dimensional organic ferromagnet

In this paper, we study the influence of electron-electron repulsive interaction and electron-phonon coupling on the total energy of the system and the amplitude of spin density wave along main chain. The e-e repulsive interaction and the e-ph coupling have the opposite effect on the stability of the system, that is to say, the stronger the electron-electron repulsive interaction is, the more stable the ferromagnetic ground state of the system is, but the strength of the electron-phonon coupling will be disadvantageous to the stability of the ferromagnetic ground state.