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Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc=42K

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Medvedev,  Sergey A.
Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Shylin, S. I., Ksenofontov, V., Sedlmaier, S. J., Clarke, S. J., Cassidy, S. J., Wortmann, G., et al. (2015). Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc=42K. EPL, 109(6): 67004, pp. 1-6. doi:10.1209/0295-5075/109/67004.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-B296-1
Abstract
Fe-57-Mossbauer spectra of superconducting beta-FeSe, the Li/NH3 intercalate product and a subsequent sample of this intercalate treated with moist He gas have been measured in the temperature range 4.7-290 K. A correlation is established between hyperfine parameters and critical temperature T-c in these phases. A strong increase of the isomer shift upon intercalation is explained by a charge transfer from the Li/NH3 intercalate to the FeSe layers resulting in an increase of Tc up to 42K. A significant decrease of the quadrupole splitting above 240 K has been attributed to diffusive motion of Li+ ions within the interlamellar space. Copyright (C) EPLA, 2015