准一维有机铁磁体中的位间电子-电子相互作用

Inter-Site Electron-Electron Interaction in a Quasi-One-DimensionalOrganic Ferromagnet

利用扩展的Hubbard模型,对具有链间耦合的准一维有机铁磁链系统的稳定性进行了研究。结果表明,最近邻格点间电子Coulomb排斥相互作用的加强将削弱系统高自旋铁磁性基态的稳定性;电子-声子耦合相互作用与最近邻格点间电子Coulomb排斥相互作用对稳定系统的高自旋铁磁性基态起着不同的作用;系统内的第三近邻电子跳跃相互作用与最近邻格点间电子Coulomb排斥相互作用之间存在着竞争。此外,对系统中的电荷密度和自旋密度分布受最近邻格点间电子Coulomb相互作用影响情况亦进行了讨论。

The stability of interchains coupled quasi-one-dimensional organic ferromagnetic chains is studied using the Extended-Hubbard model. The results show that the stability of the high-spin ferromagnetic ground state of the system will be weakened by the nearest neighbour Coulomb repulsion while the electron-phone coupling is beneficial for the stability, and the competition will arise between the nearest neighbour Coulomb repulsion and the third-nearest neighbour hopping interaction. The effects of the nearest neighbour Coulomb repulsion on the distribution of the charge density and the spin density are also discussed.