Volume 109, Number 6, March 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 May 2015|
Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc = 42 K
1 Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University Mainz - Staudingerweg 9, D-55099 Mainz, Germany
2 Department of Chemistry, Taras Shevchenko National University of Kyiv - Volodymyrska 64/13, 01601 Kyiv, Ukraine
3 Department of Chemistry, University of Oxford - Oxford OX1 3QR, UK
4 Department of Physics, University of Paderborn - D-33095 Paderborn, Germany
5 Max Planck Institute for Chemical Physics of Solids - D-01187 Dresden, Germany
Received: 30 January 2015
Accepted: 12 March 2015
57Fe-Mössbauer spectra of superconducting β-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 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 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.
PACS: 74.70.Xa – Pnictides and chalcogenides / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition
© EPLA, 2015
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