准一维有机聚合物铁磁体中的电子-电子相互作用

Electron-Electron Interactions in Quasi-One-Dimensional Organic Polymer Ferromagnet

考虑电子-电子相互作用,对具有链间耦合的准一维有机聚合物铁磁体的电子结构和自旋结构进行了研究.结果表明,对于维持系统的铁磁态的稳定性而言,系统内的在位电子-电子Hub-bard排斥相互作用与最近邻格点间的电子-电子Coulomb排斥相互作用所起的作用相反,彼此间存在着竞争;最近邻格点间的电子-电子Coulomb排斥相互作用的加强将导致主链反铁磁性自旋密度波(SDW)之振幅的减小,使得主链反铁磁性SDW的耦合传递作用减弱,进而影响到侧自由基自旋间的铁磁耦合强度,这将削弱系统铁磁态的稳定性.

Considering the electron-electron interactions, the configurations of electron and spin in an interchain coupled quasi-one-dimensional organic polymer ferromag(?)et are studies. The results show that the role played by the on-site electron-electron Hubbard repulsion in maintaining the stability of the ferromagnetic state is contrary to that played by the inter-site electron-electron Coulomb repulsive interactions and there exists a competition with each other. The amplitude of the spin density wave (SDW) along the main chain will decrease with increasing of the inter-site electron-electron Cou omb repulsive interaction, which will weaken the mediating function of the antiferromagnetic SDW along the main chain, and accordingly affect the ferromagnetic coupling intensity between the spins of the side free-(?)adicals, and finally weaken the stability of the ferromagnetic state in the system.