Spin excitations in a K0.84Fe1.99Se2 superconductor as studied by Mssbauer spectroscopy |
| |
Authors: | Li Zhi-Wei Ma Xiao-Ming Pang Hua and Li Fa-Shen |
| |
Institution: | Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China |
| |
Abstract: | Mssbauer spectroscopy was used to probe the site-specific information of a K 0.84 Fe 1.99 Se 2 superconductor. A spin excitation gap, △E ≈ 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. |
| |
Keywords: | Mssbauer spectroscopy iron-selenide superconductivity |
本文献已被 CNKI 维普 等数据库收录! |
|