Abstract
Polycrystalline samples of FeSe0.82 and FeSe0.5Te0.5 were synthesized using a solid-state reaction route. Bulk superconductivity was confirmed using SQUID magnetometry. The onset of T c was at 8.0 K for FeSe0.82 and 12.5 K for FeSe0.5Te0.5. Paramagnetic 57Fe Mössbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe0.5Te0.5 a small drop in the quadrupole splitting was observed about T c upon cooling. Additionally, for both samples the isomer shift and the total absorption started to drop around T c , indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperatures.
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Lindén, J.K.M., Rautama, EL., Karppinen, M., Yamauchi, H. (2011). A 57Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors: discontinuities in the hyperfine parameters at T c . In: Yoshida, Y. (eds) ICAME 2011. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4762-3_123
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DOI: https://doi.org/10.1007/978-94-007-4762-3_123
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-4761-6
Online ISBN: 978-94-007-4762-3
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