论文标题
在几何沮丧的抗fiferromagnet中取消纳米级退化
Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet
论文作者
论文摘要
该化合物的局部原子和磁性结构$ a $ mno $ _2 $（$ a $ = na，cu）认识到MN旋转的几何沮丧的，空间上各向异性的三角形晶格，已通过原子和磁对分配函数的中子散射数据的分析进行了研究。 Cumno $ _2 $中挫败感的缓解伴随着由Néel订单驱动的传统合作对称性降低的晶格失真。但是，在namno $ _2 $中，失真具有短距离性质。局部破碎的对称性和短距离磁相关之间的合作相互作用可以在纳米长度尺度上提高磁性变性，从而在NA衍生方面实现了远距离磁性。残留障碍介导的挫败感有助于在这两种相关化合物中通往单个稳定磁场状态的途径较大的途径。这项研究表明，导致局部尺寸扰动的纳米级结构扭曲如何提高基态变性并触发宏观磁性。
The local atomic and magnetic structures of the compounds $A$MnO$_2$ ($A$ = Na, Cu), which realize a geometrically frustrated, spatially anisotropic triangular lattice of Mn spins, have been investigated by atomic and magnetic pair distribution function analysis of neutron total scattering data. Relief of frustration in CuMnO$_2$ is accompanied by a conventional cooperative symmetry-lowering lattice distortion driven by Néel order. In NaMnO$_2$, however, the distortion has a short-range nature. A cooperative interaction between the locally broken symmetry and short-range magnetic correlations lifts the magnetic degeneracy on a nanometer length scale, enabling long-range magnetic order in the Na-derivative. The degree of frustration, mediated by residual disorder, contributes to the rather differing pathways to a single, stable magnetic ground state in these two related compounds. This study demonstrates how nanoscale structural distortions that cause local-scale perturbations can lift the ground state degeneracy and trigger macroscopic magnetic order.
