论文标题
在粉末压力和分层抗fiferromagnet FEPS $ _3 $的粉末和单晶压力下的比较结构演变
Comparative structural evolution under pressure of powder and single crystals of the layered antiferromagnet FePS$_3$
论文作者
论文摘要
层状的抗铁磁铁FEPS $ _3 $已显示在与绝缘体 - 金属过渡相关的压力下进行结构过渡，并以前提出了针对最高压力结构的两个不兼容的模型。我们介绍了使用单晶和粉末X射线衍射的FEPS $ _3 $的高压晶体结构的研究。我们表明，最高的压力转变涉及该材料的平面间间距的崩溃，以及从单斜层到三角形结构的对称性增加，再到其他模型的排除。该体积崩溃的程度被证明对样品环境中的氦压力培养基很敏感，这表明考虑此类实验因素对于理解该材料中的高压行为很重要。
The layered antiferromagnet FePS$_3$ has been shown to undergo a structural transition under pressure linked to an insulator-metal transition, with two incompatible models previously proposed for the highest-pressure structure. We present a study of the high-pressure crystal structures of FePS$_3$ using both single-crystal and powder x-ray diffraction. We show that the highest pressure transition involves a collapse of the inter-planar spacing of this material, along with an increase in symmetry from a monoclinic to a trigonal structure, to the exclusion of other models. The extent of this volume collapse is shown to be sensitive to the presence of a helium pressure medium in the sample environment, indicating that consideration of such experimental factors is important for understanding high-pressure behaviours in this material.
