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arXiv 2203.07015cond-mat.str-el
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层状反铁磁体FePS $_3$粉末和单晶在压力下结构演化的比较

Comparative structural evolution under pressure of powder and single crystals of the layered antiferromagnet FePS$_3$

David M. Jarvis, Matthew J. Coak, Hayrullo Hamidov, Charles R. S. Haines, Giulio I. Lampronti, Cheng Liu, Shiyu Deng, Dominik Daisenberger, David R. Allan, Mark… 展开作者

David M. Jarvis, Matthew J. Coak, Hayrullo Hamidov, Charles R. S. Haines, Giulio I. Lampronti, Cheng Liu, Shiyu Deng, Dominik Daisenberger, David R. Allan, Mark R. Warren, Andrew R. Wildes, Siddharth S. Saxena

摘要:

层状反铁磁体FePS $_3$已被证明在压力下经历与绝缘体-金属转变相关的结构转变,先前提出了两种不相容的模型用于最高压力结构。我们提出了一个研究的高压晶体结构的FePS $_3$使用单晶和粉末X射线衍射。我们发现,最高的压力过渡涉及到这种材料的面间间距的崩溃,随着对称性从单斜晶系到三角结构的增加,排除其他模型。这种体积塌陷的程度被证明是敏感的样品环境中的氦气压力介质的存在下,表明考虑这些实验因素是很重要的理解在这种材料中的高压行为。

英文摘要:

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.

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