Abstract
Although pairing mechanism in unconventional superconductors is still an open question, the density of states at the Fermi level is considered to be one of the factors affecting the superconducting transition temperature. Herein, we report on 57Fe-Mössbauer studies of β-FeSe, FeSe 0.5Te 0.5, and Rb 0.8Fe 1.6Se 2 superconductors as well as two intercalate products consisting of FeSe layers and a lithium-containing molecular spacer in between. In these materials, the hyperfine parameters of 57Fe are directly related to the 3d-electron density on Fe atoms and show strong correlation with superconducting properties.
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Acknowledgments
This work was supported by the DFG within the Priority Program No. 1458 (grants KS51/2-2 and ME3652/1-2). The authors are grateful to the group of Prof. S. J. Clarke and Dr. V. Tsurkan for providing samples and to Prof. G. Wortmann for helpful discussion.
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Shylin, S.I., Ksenofontov, V., Medvedev, S.A. et al. Correlation Between T c and Hyperfine Parameters of Fe in Layered Chalcogenide Superconductors. J Supercond Nov Magn 29, 573–576 (2016). https://doi.org/10.1007/s10948-015-3299-8
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DOI: https://doi.org/10.1007/s10948-015-3299-8