【有机金属分子铁磁体的理论模型及磁有序研究】段永法.pdf

ADissertationSubmittedinPartialFulfillmentofthe Requirementsfor theDegree of Doctor ofPhilosophyinPhysical Electronics StudyonTheoreticalModelandFerrimagneticOrderingin Organometallic-radicalMagnets Ph.D.Candidate:Duan Yongfa Major:Physical Electronics Supervisor:Prof.

华中科技大学博士学位论文隙也在减小。Hubbard在位电子排斥能和最近邻格点之间电子一电子Coulomb相互作用能对系统的亚铁磁基态起着相反的作用,前者使系统的高自旋基态趋于稳定,而后者不利于高自旋基态的稳定.在端点固定的边界条件下,电子关联和电子一声子耦合使得系统沿链存在看描述品格畸变的畴壁狐子:纯有机铁磁体沿侧基出现自旋孤子,有机金属分子铁磁体沿链出现波包孤子。周期性边界条件下的亚铁磁态是系统的基态,而端点固定边界条件下的业铁磁态对应系统的低激发态。

华中科技大学博士学位论文 result of the competitionbetween the e-einteractionande-phcoupling.It is shown that the dimerizationwillweaken the stability of thehigh spin ground state of the system.So in the stableferrimagnetic ground state.almost thereis nodimerization along thechain.