Observation of lattice softening at Tc in the FeSe0.5Te0.5 superconductor

J. Lindén; J. P. Libäck; M. Karppinen; E. L. Rautama; H. Yamauchi

doi:10.1016/j.ssc.2010.11.006

Observation of lattice softening at T_c in the FeSe_0.5Te_0.5 superconductor

J. Lindén^*, J. P. Libäck, M. Karppinen, E. L. Rautama, H. Yamauchi

^*Corresponding author for this work

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

23 Citations (Scopus)

Abstract

Polycrystalline samples of FeSe_0.5Te_0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K. ⁵⁷Fe Mssbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about Tc, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θ_D≈460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.

Original language	English
Pages (from-to)	130-134
Number of pages	5
Journal	Solid State Communications
Volume	151
Issue number	2
DOIs	https://doi.org/10.1016/j.ssc.2010.11.006
Publication status	Published - Jan 2011
MoE publication type	A1 Journal article-refereed

Keywords

A. Pnictide superconductors
D. Lattice softening
E. Fe Mssbauer spectroscopy
E. Hyperfine interactions

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10.1016/j.ssc.2010.11.006

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title = "Observation of lattice softening at Tc in the FeSe0.5Te0.5 superconductor",

abstract = "Polycrystalline samples of FeSe0.5Te0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K. 57Fe Mssbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about Tc, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θD≈460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.",

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doi = "10.1016/j.ssc.2010.11.006",

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T1 - Observation of lattice softening at Tc in the FeSe0.5Te0.5 superconductor

AU - Lindén, J.

AU - Libäck, J. P.

AU - Karppinen, M.

AU - Rautama, E. L.

AU - Yamauchi, H.

PY - 2011/1

Y1 - 2011/1

N2 - Polycrystalline samples of FeSe0.5Te0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K. 57Fe Mssbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about Tc, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θD≈460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.

AB - Polycrystalline samples of FeSe0.5Te0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K. 57Fe Mssbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about Tc, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θD≈460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.

KW - A. Pnictide superconductors

KW - D. Lattice softening

KW - E. Fe Mssbauer spectroscopy

KW - E. Hyperfine interactions

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DO - 10.1016/j.ssc.2010.11.006

M3 - Article

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SN - 0038-1098

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EP - 134

JO - Solid State Communications

JF - Solid State Communications

IS - 2

ER -

Observation of lattice softening at T_c in the FeSe_0.5Te_0.5 superconductor

Abstract

Keywords

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