A 57Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors: Discontinuities in the hyperfine parameters at Tc

Johan Kaarle Mikael Lindén; Eeva Leena Rautama; Maarit Karppinen; Hisao Yamauchi

doi:10.1007/s10751-011-0482-6

A ⁵⁷Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors: Discontinuities in the hyperfine parameters at T_c

Johan Kaarle Mikael Lindén, Eeva Leena Rautama, Maarit Karppinen, Hisao Yamauchi

Åbo Akademi University

Research output: Contribution to journal › Article › Scientific › peer-review

6 Citations (Scopus)

Abstract

Polycrystalline samples of FeSe _0.82 and FeSe _0.5Te _0.5 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 FeSe _0.82 and 12.5 K for FeSe _0.5Te _0.5. Paramagnetic ⁵⁷Fe Mössbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe _0.5Te _0.5 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.

Original language	English
Pages (from-to)	133-136
Number of pages	4
Journal	Hyperfine Interactions
Volume	208
Issue number	1-3
DOIs	https://doi.org/10.1007/s10751-011-0482-6
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

Keywords

Fe Mössbauer spectroscopy
Chalcogenide superconductivity
Iron-based superconductors

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10.1007/s10751-011-0482-6

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title = "A 57Fe M{\"o}ssbauer study on the FeSe and Fe(Se,Te) superconductors: Discontinuities in the hyperfine parameters at Tc",

abstract = "Polycrystalline samples of FeSe 0.82 and FeSe 0.5Te 0.5 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 FeSe 0.82 and 12.5 K for FeSe 0.5Te 0.5. Paramagnetic 57Fe M{\"o}ssbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe 0.5Te 0.5 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.",

keywords = "Fe M{\"o}ssbauer spectroscopy, Chalcogenide superconductivity, Iron-based superconductors",

author = "Lind{\'e}n, \{Johan Kaarle Mikael\} and Rautama, \{Eeva Leena\} and Maarit Karppinen and Hisao Yamauchi",

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doi = "10.1007/s10751-011-0482-6",

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T1 - A 57Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors

T2 - Discontinuities in the hyperfine parameters at Tc

AU - Lindén, Johan Kaarle Mikael

AU - Rautama, Eeva Leena

AU - Karppinen, Maarit

AU - Yamauchi, Hisao

PY - 2012

Y1 - 2012

N2 - Polycrystalline samples of FeSe 0.82 and FeSe 0.5Te 0.5 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 FeSe 0.82 and 12.5 K for FeSe 0.5Te 0.5. Paramagnetic 57Fe Mössbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe 0.5Te 0.5 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.

AB - Polycrystalline samples of FeSe 0.82 and FeSe 0.5Te 0.5 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 FeSe 0.82 and 12.5 K for FeSe 0.5Te 0.5. Paramagnetic 57Fe Mössbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe 0.5Te 0.5 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.

KW - Fe Mössbauer spectroscopy

KW - Chalcogenide superconductivity

KW - Iron-based superconductors

UR - https://www.scopus.com/pages/publications/84859598472

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DO - 10.1007/s10751-011-0482-6

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ER -

A ⁵⁷Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors: Discontinuities in the hyperfine parameters at T_c

Abstract

Keywords

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