论文标题
磁性金属有机框架中的lillium晶格的几何挫败感
Geometric frustration on the trillium lattice in a magnetic metal-organic framework
论文作者
论文摘要
在密集的金属有机框架中，Na [Mn（HCOO）$ _ 3 $]，Mn $^{2+} $ ions（$ s = \ frac {5} {2} $）占据了frillium'Hyperkagome Net的节点。我们表明，该材料表现出几何挫败感的各种行为特征：Néel转变远低于特征磁相互作用强度；短距离磁顺序持续远远高于Néel温度。磁化率在$ \ frac {1} {3} $ - 饱和磁化时表现出一个伪 - 斑点。我们证明，对于每个观察值，一个简单的最接近的海森贝格抗铁磁铁模型帐户，因此Na [Mn（HCOO）$ _ 3 $]是Trillium Net上此模型的第一个实验实现。我们在这个trillium模型和二维Shastry-Sutherland晶格之间开发了一个映射，并演示了两者在经典旋转液体状态中的几何挫败感如何与低场处的强磁反应联系起来。
In the dense metal-organic framework Na[Mn(HCOO)$_3$], Mn$^{2+}$ ions ($S=\frac{5}{2}$) occupy the nodes of a `trillium' hyperkagome net. We show that this material exhibits a variety of behaviour characteristic of geometric frustration: the Néel transition is suppressed well below the characteristic magnetic interaction strength; short-range magnetic order persists far above the Néel temperature; and the magnetic susceptibility exhibits a pseudo-plateau at $\frac{1}{3}$-saturation magnetisation. We demonstrate that a simple nearest-neighbour Heisenberg antiferromagnet model accounts quantitatively for each observation, and hence Na[Mn(HCOO)$_3$] is the first experimental realisation of this model on the trillium net. We develop a mapping between this trillium model and that on the two-dimensional Shastry-Sutherland lattice, and demonstrate how both link geometric frustration within the classical spin liquid regime to a strong magnetocaloric response at low fields.
