Magnetic frustration and iron-vacancy ordering in iron chalcogenide

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	Magnetic frustration and iron-vacancy ordering in iron chalcogenide
	Xiang, T
刊名	PHYSICAL REVIEW B
	2012
卷号	85 期号:13 页码:134406
关键词	EXCHANGE INTERACTIONS SPIN-WAVES SUPERCONDUCTIVITY
ISSN号	1098-0121
通讯作者	Fang, C (reprint author), Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
英文摘要	We study the spin-and vacancy-ordered states in 122 iron chalcogenides (A(1-y)Fe(2-x)Se(2)) by inspecting the magnetic ground states of a J(1)-J(2)-J(3) model on different vacancy-ordered lattices observed/conjectured in these compounds. A highly frustrated J(1)-J(2)-J(3) model was first applied to the study of magnetism in FeTe and was reported to explain the inelastic neutron-scattering data qualitatively. We find that the vacancy-ordered states are generally energetically favored for their reduction of magnetic frustration inherent to the spin-exchange model and, especially, that the 245 vacancy-spin-ordered state minimizes the magnetic exchange energy among all known vacancy-ordered states, in line with the fact that it has the highest vacancy-ordering phase transition temperature and the largest ordered moment in all iron-based superconductors. Thus, our study provides an electronic perspective for understanding the various vacancy orderings in these compounds. Then we focus on the experimentally well-studied 245 state and calculate the spin-wave spectrum and dynamic spin susceptibility. Finding that the key features of these calculated quantities are consistent with a recent inelastic neutron-scattering experiment, we conclude that we have obtained a qualitative local spin model for the 245 state. We also discuss the possibility of a unified local-moment description for all iron chalcogenides based on our result.
学科主题	Physics
收录类别	SCI
原文出处	http://dx.doi.org/10.1103/PhysRevB.85.134406
语种	英语
WOS记录号	WOS:000302235300006
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15121]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Xiang, T. Magnetic frustration and iron-vacancy ordering in iron chalcogenide[J]. PHYSICAL REVIEW B,2012,85(13):134406.
APA	Xiang, T.(2012).Magnetic frustration and iron-vacancy ordering in iron chalcogenide.PHYSICAL REVIEW B,85(13),134406.
MLA	Xiang, T."Magnetic frustration and iron-vacancy ordering in iron chalcogenide".PHYSICAL REVIEW B 85.13(2012):134406.