ITP OpenIR  > SCI期刊论文
Fang, C; Xu, B; Dai, PC; Xiang, T; Hu, JP; Fang, C (reprint author), Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
Magnetic frustration and iron-vacancy ordering in iron chalcogenide
Source PublicationPHYSICAL REVIEW B
Language英语
KeywordExchange Interactions Spin-waves Superconductivity
AbstractWe 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.
2012
ISSN1098-0121
Volume85Issue:13Pages:134406
Subject AreaPhysics
Indexed BySCI
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15121
CollectionSCI期刊论文
Corresponding AuthorFang, C (reprint author), Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
Recommended Citation
GB/T 7714
Fang, C,Xu, B,Dai, PC,et al. Magnetic frustration and iron-vacancy ordering in iron chalcogenide[J]. PHYSICAL REVIEW B,2012,85(13):134406.
APA Fang, C,Xu, B,Dai, PC,Xiang, T,Hu, JP,&Fang, C .(2012).Magnetic frustration and iron-vacancy ordering in iron chalcogenide.PHYSICAL REVIEW B,85(13),134406.
MLA Fang, C,et al."Magnetic frustration and iron-vacancy ordering in iron chalcogenide".PHYSICAL REVIEW B 85.13(2012):134406.
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