论文标题
铜六聚体中的自旋耦合拓扑化合物A $ _2 $ CU $ _3 $ O（SO $ _4 $）$ _ 3 $（a = na，k）
Spin-Coupling Topology in the Copper Hexamer Compounds A$_2$Cu$_3$O(SO$_4$)$_3$ (A=Na, K)
论文作者
论文摘要
化合物A $ _2 $ CU $ _3 $ O（SO $ _4 $）$ _ 3 $（a = Na，K）的特征是铜六聚体弱耦合以实现抗铁磁序以在TN = 3 k的下面实现抗铁磁序。它们构成了S = 1个三胞胎地面 - 构成Novel Novel量子系统。我们通过覆盖磁激发光谱的整个范围的无弹性中子散射实验来研究铜六聚体的能级分裂。观察到的过渡受非常不寻常的选择规则的控制，我们将其归因于潜在的自旋耦合拓扑。这是通过模型计算合理化的，该计算允许对磁性激励的明确解释有关自旋耦合参数的峰分配和性质。
The compounds A$_2$Cu$_3$O(SO$_4$)$_3$ (A=Na, K) are characterized by copper hexamers which are weakly coupled to realize antiferromagnetic order below TN=3 K. They constitute novel quantum spin systems with S=1 triplet ground-states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules which we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations which allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters.
