Knowledge Management System of Institute of Theoretical Physics, CAS
Fang, C; Xu, B; Dai, PC; Xiang, T ; Hu, JP; Fang, C (reprint author), Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
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| Magnetic frustration and iron-vacancy ordering in iron chalcogenide | |
| Source Publication | PHYSICAL REVIEW B
 |
| Language | 英语 |
| Keyword | Exchange Interactions Spin-waves Superconductivity |
| Abstract | 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. |
| 2012 | |
| ISSN | 1098-0121 |
| Volume | 85Issue:13Pages:134406 |
| Subject Area | Physics |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/15121 |
| Collection | SCI期刊论文 |
| Corresponding Author | Fang, 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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