Symmetry analysis of the structural and magnetic phase transitions in 122 iron arsenides.

IF 1.9 3区化学 Acta Crystallographica Section B-structural Science Pub Date : 2012-04-01 Epub Date: 2012-03-20 DOI:10.1107/S0108768112008294

Christopher J Howard, Michael A Carpenter

引用次数: 8

Abstract

It is evident from the literature that the 122 iron arsenides, XFe(2)As(2) with X = Ca, Sr, Ba or Eu, undergo one or more phase transitions from a higher-temperature paramagnetic tetragonal structure in grey group I4/mmm1' to an antiferromagnetic structure with magnetic space group C(A)mca. Symmetry analysis is used to enumerate the possibilities for the transition (or transitions) between the higher- and lower-symmetry structures, and the results are used as a basis for comment on published experimental results.

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122种砷化铁结构和磁相变的对称性分析。

从文献中可以明显地看出，122种砷化铁，X = Ca, Sr, Ba或Eu的XFe(2)As(2)，经历了一个或多个相变，从灰色族I4/ mm1'的高温顺磁四方结构转变为磁空间族C(a)mca的反铁磁结构。对称性分析用于列举高对称性和低对称性结构之间跃迁的可能性，并将结果用作评论已发表的实验结果的基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Crystallographica Section B-structural Science 化学-晶体学

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their temporal variations and dependencies on temperature and pressure, is often the key to understanding physical and chemical phenomena and is crucial for the design of new materials and supramolecular devices. Acta Crystallographica B is the forum for the publication of such contributions. Scientific developments based on experimental studies as well as those based on theoretical approaches, including crystal-structure prediction, structure-property relations and the use of databases of crystal structures, are published.