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

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Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

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Sammanfattning

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.

Originalspråk	Engelska
Sidor (från-till)	130-134
Antal sidor	5
Tidskrift	Solid State Communications
Volym	151
Nummer	2
DOI	https://doi.org/10.1016/j.ssc.2010.11.006
Status	Publicerad - jan. 2011
MoE-publikationstyp	A1 Tidskriftsartikel-refererad

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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.",

keywords = "A. Pnictide superconductors, D. Lattice softening, E. Fe Mssbauer spectroscopy, E. Hyperfine interactions",

author = "J. Lind{\'e}n and Lib{\"a}ck, {J. P.} and M. Karppinen and Rautama, {E. L.} and H. Yamauchi",

year = "2011",

month = jan,

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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