论文标题
Spin-1/2中的晶格动力学沮丧的Kagome复合物Herbertsmithite
Lattice dynamics in the spin-1/2 frustrated kagome compound herbertsmithite
论文作者
论文摘要
We investigate the lattice dynamics in the spin-1/2 frustrated kagome compound herbertsmithite ZnCu$_3$(OH)$_6$Cl$_2$ by a combination of infrared spectroscopy measurements and ab initio density functional theory calculations, and provide an unambiguous assignment of infrared-active lattice vibrations involving in-plane and out-of-plane atom displacements in the kagome层。冷却后，非热红移和宽扩展专门针对变形kagome层或影响Cu-O-Cu键角的模式，从而产生了对抗铁磁交换耦合的明显修改。我们的结果表明，与自旋系统存在强磁弹性耦合。我们讨论了这种耦合的效果及其与最近报告的kagome晶格对称性减少全球对称性的实验的关系。
We investigate the lattice dynamics in the spin-1/2 frustrated kagome compound herbertsmithite ZnCu$_3$(OH)$_6$Cl$_2$ by a combination of infrared spectroscopy measurements and ab initio density functional theory calculations, and provide an unambiguous assignment of infrared-active lattice vibrations involving in-plane and out-of-plane atom displacements in the kagome layers. Upon cooling, non-thermal red-shifts and broadening appear specifically for modes that deform the kagome layer or affect the Cu-O-Cu bond angles, thus creating pronounced modifications of the antiferromagnetic exchange coupling. Our results indicate the presence of a strong magnetoelastic coupling to the spin system. We discuss the effects of this coupling and its relation to recent experiments reporting a global symmetry reduction of the kagome lattice symmetry.
