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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24 Sitaatiot (Scopus)

Abstrakti

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.

Alkuperäiskieli	Englanti
Sivut	130-134
Sivumäärä	5
Julkaisu	Solid State Communications
Vuosikerta	151
Numero	2
DOI - pysyväislinkit	https://doi.org/10.1016/j.ssc.2010.11.006
Tila	Julkaistu - tammik. 2011
OKM-julkaisutyyppi	A1 Julkaistu artikkeli, soviteltu

Rahoitus

Mr. M. Lehtimäki and Mr. T. Tynell are acknowledged for their help with performing the XRD and Seebeck characterizations. Prof. P. Paturi of Wihuri Research Center is acknowledged for her contribution to the in-field Seebeck measurements. Mr. S. Fröjdö is acknowledged for his assistance with the sample synthesis. This work was partially supported by Tekes (No. 1726/31/07 ) and Academy of Finland (No. 126528 ).

Pääsy asiakirjaan

10.1016/j.ssc.2010.11.006

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Link to publication in Scopus

Viittausmuodot

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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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TY - JOUR

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

UR - https://www.scopus.com/pages/publications/78650510466

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DO - 10.1016/j.ssc.2010.11.006

M3 - Article

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JO - Solid State Communications

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