Spin excitations in a K0.84Fe1.99Se2 superconductor as studied by Mossbauer spectroscopy

被引：8
|
作者：
Li Zhi-Wei [1 ]
Ma Xiao-Ming [1 ]
Pang Hua [1 ]
Li Fa-Shen [1 ]
机构：
[1] Lanzhou Univ, Inst Appl Magnet, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China
来源：
CHINESE PHYSICS B | 2012年 / 21卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Mossbauer spectroscopy; iron-selenide; superconductivity; DYNAMICS; LA2-XSRXCUO4; SPECTRUM; STATE; GAPS; FE;
D O I：
10.1088/1674-1056/21/4/047601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Mossbauer spectroscopy was used to probe the site-specific information of a K0.84Fe1.99Se2 superconductor. A spin excitation gap, Delta E approximate to 5.5 meV, is observed by analyzing the temperature dependence of the hyperfine magnetic field (HMF) at the iron site within the spin wave theory. Using the simple model suggested in the literature, the temperature dependence of the HMF is well reproduced, suggesting that, below room temperature, the alkali metal intercalated iron selenide superconductors can be regarded as ferromagnetically coupled spin blocks that interact with each other antiferromagnetically to form the observed checkerboard-like magnetic structure.
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收藏
页数：6
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