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

Authors :: Shylin, Sergii I
Ksenofontov, Vadim
Sedlmaier, Stefan J
Clarke, Simon J
Cassidy, Simon J
Wortmann, Gerhard
Medvedev, Sergey A
Felser, Claudia
Source :: Shylin S.I., Ksenofontov V., Sedlmaier S.J., Clarke S.J., Cassidy S.J., Wortmann G., Medvedev S.A., Felser C.: EPL 109, 67004 (2015)
Publication Year :: 2015
Abstract: 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.<br />Comment: 6 pages, 5 figures, 1 table

Database :: arXiv
Journal :: Shylin S.I., Ksenofontov V., Sedlmaier S.J., Clarke S.J., Cassidy S.J., Wortmann G., Medvedev S.A., Felser C.: EPL 109, 67004 (2015)
Publication Type :: Report
Accession number :: edsarx.1511.04393
Document Type :: Working Paper
Full Text :: https://doi.org/10.1209/0295-5075/109/67004

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