论文标题
金属有机框架中集中的pyrochlore晶格的挫败感
Frustration on a centred pyrochlore lattice in metal-organic frameworks
论文作者
论文摘要
几何挫败感抑制了磁系统的订购，打开了物质非常规阶段的窗口。在三个维度上的范式沮丧的晶格可以容纳旋转液体，这是pyrochlore，尽管几乎没有实验化合物被认为实现这种状态的实验化合物。在这里，我们在金属兹酸酯框架[Mn（ii）（ta）$ _ 2 $]中通过分子设计超越了pyrochlore，该框架实现了Mn-Spins的密切相关的pyrochlore晶格，其中$ s = 5/2 $。尽管Curie-Weiss温度为$ -21 $ k表示磁相互作用的能量尺度，但[Mn（ii）（ta）$ _ 2 $]的订单仅为430 mk，将其牢固地置于高度沮丧的磁铁类别中。将磁化强度和特定的热量测量与最小的海森堡模型的数值结果进行比较，我们预测，该材料将显示出具有指示库仑物理学的结构因子的经典自旋液体的不同特征。
Geometric frustration inhibits magnetic systems from ordering, opening a window to unconventional phases of matter. The paradigmatic frustrated lattice in three dimensions to host a spin liquid is the pyrochlore, although there remain few experimental compounds thought to realize such a state. Here we go beyond the pyrochlore via molecular design in the metal-azolate framework [Mn(II)(ta)$_2$], which realizes a closely related centred pyrochlore lattice of Mn-spins with $S=5/2$. Despite a Curie-Weiss temperature of $-21$ K indicating the energy scale of magnetic interactions, [Mn(II)(ta)$_2$] orders at only 430 mK, putting it firmly in the category of highly frustrated magnets. Comparing magnetization and specific heat measurements to numerical results for a minimal Heisenberg model, we predict that this material displays distinct features of a classical spin liquid with a structure factor reflecting Coulomb physics in the presence of charges.
