海森堡链SP相变与磁耦合系数的关系  

The Relations between Heisenberg Chain SP Phase Transitions and Magnetic Coupling Coefficient

作　　者：陈泽章[1,2] 徐彦[1] 梁彦天[1] 

机构地区：[1]新乡学院物理与电子工程学院,河南新乡453003 [2]河南师范大学物理与电子工程学院,河南新乡453007

出　　处：《信阳师范学院学报（自然科学版）》2014年第4期502-504,共3页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：河南省基础与前沿技术研究计划项目(132300410007);新乡学院理论物理重点学科专项基金资助课题

摘　　要：在考虑自旋和晶格之间的相互作用情况下,用密度矩阵重整化群方法分析计算了一个自旋为12的一维受阻挫海森堡反铁磁自旋链模型发生自旋-派尔斯相变时动态二聚体与磁耦合系数之间的关系,发现当磁耦合系数趋于0时,在有限阻挫及有限能隙的零耦合状态下,二聚化态将会消失.In considering the interaction between the spin and lattice case, the relation between dynamic dimer and magnetic coupling coefficient was analysized with the density matrix renormalization group method when a one-dimen-sional blocked frustrated Heisenberg antiferromagnetic spin chain model occurred Spin-Peierls phase change. The re-sults demonstrated that when the magnetic coupling coefficient tends to 0, the dimerization state would disappears in the state for the zero coupling between the limited and finite energy gap.

关 键 词：海森堡链 相变 磁耦合系数 

分 类 号：O413.1[理学—理论物理]