摘要
基于考虑链间耦合的准一维有机铁磁体的理论模型 ,对存在于系统内的电荷密度波 ( CDW)和自旋密度波 ( SDW)进行了研究 .结果表明 ,系统链间耦合的振荡部分的加强将导致主链反铁磁性 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 ;在改变系统内有关耦合参数的情况下 ,均存在一个最近邻格点间的电子 -电子 Coulomb排斥相互作用的临界值 ,在该临界值处 ,系统将发生由强SDW态向强
Based on a theoretical model for interchain coupled quasi-one-dimensional organic ferromagnet, the charge density wave(CDW) and spin density wave(SDW) that exist in the system are investigated. The results show that the amplitude of the SDW along the main chain will decrease with increasing of the oscillatory term of the interchain couplings in the system, 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-radicals, and finally weaken the stability of the ferromagnetic state in the system. When the strengths of various couplings are changed, there will exist a critical point of the inter-site electron-electron Coulomb repulsion, and at this point, the system will experience a transformation from strong SDW state to strong SDW one.
出处
《武汉理工大学学报（交通科学与工程版）》
北大核心
2004年第3期334-337,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金 (批准号 :90 10 3 0 3 4)
湖北省自然科学基金项目资助 (批准号 :2 0 0 3 A13 A0 2 8)
关键词
有机铁磁体
电荷密度波
自旋密度波
organic ferromagnet
charge density wave
spin density wave
