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要旨:
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
