论文标题
在三角形晶格上扩展的Falicov-kimball模型中的内部和间交换相关性的作用
The Role of Intra- and Inter-site exchange correlations in the Extended Falicov-Kimball Model on a Triangular Lattice
论文作者
论文摘要
通过合并内部的交换相关性J（介绍$ d $ - 和本地化的$ f $ - 电子）和intersite（superexchange）相关性来研究旋转依赖的falicov-kimball模型（FKM）的基态磁性特性（FKM）。数值对角线化和蒙特卡洛技术用于确定基态磁性。在广泛的参数空间中观察到了从抗铁磁到铁磁性的转变。观察到$ d $ - 和$ f $ - 电子的磁性矩很大程度上取决于$ j $，$ j_ {se} $的值，也取决于$ d $ - 电子（$ n_d $）的总数。
Ground state magnetic properties of the spin-dependent Falicov-Kimball model (FKM) are studied by incorporating the intrasite exchange correlation J (between itinerant $d$- and localized $f$- electrons) and intersite (superexchange) correlation $J_{se}$ (between localized $f$- electrons) on a triangular lattice for two different fillings. Numerical diagonalization and Monte-Carlo techniques are used to determine the ground state magnetic properties. Transitions from antiferromagnetic to ferromagnetic and again to re-entrant antiferromagnetic phase is observed in a wide range of parameter space. The magnetic moments of $d$- and $f$- electrons are observed to depend strongly on the value of $J$, $J_{se}$ and also on the total number of $d$- electrons ($N_d$).
