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Spin excitations in a K0.84Fe1.99Se2 superconductor as studied by Mössbauer spectroscopy |
| Li Zhi-Wei(李志伟), Ma Xiao-Ming(马小明), Pang Hua(庞华)†, and Li Fa-Shen(李发伸) |
| Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract Mössbauer spectroscopy was used to probe the site-specific information of a K0.84Fe1.99Se2 superconductor. A spin excitation gap, ΔE ≈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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Received: 14 December 2011
Revised: 12 January 2012
Accepted manuscript online:
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PACS:
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76.80.+y
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(M?ssbauer effect; other γ-ray spectroscopy)
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74.10.+v
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(Occurrence, potential candidates)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10975066). |
Corresponding Authors:
Pang Hua,hpang@lzu.edu.cn
E-mail: hpang@lzu.edu.cn
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Cite this article:
Li Zhi-Wei(李志伟), Ma Xiao-Ming(马小明), Pang Hua(庞华), and Li Fa-Shen(李发伸) Spin excitations in a K0.84Fe1.99Se2 superconductor as studied by Mössbauer spectroscopy 2012 Chin. Phys. B 21 047601
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