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Paper detail

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

57Fe-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 temperature range 4.7 - 290 K. A correlation is established between hyperfine parameters and critical temperature Tc in these phases. A strong increase of 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 42 K. A significant decrease of the quadrupole splitting above 240 K has been attributed to diffusive motion of Li+ ions within the interlamellar space.

preprint2015arXivOpen access
Sergii I ShylinVadim KsenofontovStefan J SedlmaierSimon J ClarkeSimon J CassidyGerhard WortmannSergey A MedvedevClaudia Felser
cond-mat.supr-con
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Sergii I ShylinVadim KsenofontovStefan J SedlmaierSimon J ClarkeSimon J CassidyGerhard WortmannSergey A MedvedevClaudia Felser

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