Phase diagram and superconductivity at 58.1 K in α-FeAs-free SmFeAsO1-xFx

M. Fujioka; S. J. Denholme; T. Ozaki; H. Okazaki; K. Deguchi; S. Demura; H. Hara; T. Watanabe; H. Takeya; T. Yamaguchi; H. Kumakura; Y. Takano

doi:10.1088/0953-2048/26/8/085023

Phase diagram and superconductivity at 58.1 K in α-FeAs-free SmFeAsO_1-xF_x

M. Fujioka, S. J. Denholme, T. Ozaki, H. Okazaki, K. Deguchi, S. Demura, H. Hara, T. Watanabe, H. Takeya, T. Yamaguchi, H. Kumakura, Y. Takano

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

61 Citations (Scopus)

Abstract

The phase diagram of SmFeAsO_1-xF_x in terms of x is exhibited in this study. Specimens of SmFeAsO_1-xF_x from x = 0 to x = 0.3 were prepared by low-temperature sintering with slow cooling. The low-temperature sintering suppresses the formation of the amorphous FeAs, which is inevitably produced as an impurity when using high-temperature sintering. Moreover, slow cooling is effective in obtaining a high fluorine concentration. The compositional change from feedstock composition is quite small after this synthesis. We can reproducibly observe a record superconducting transition for an iron-based superconductor at 58.1 K. This achievement of a high superconducting transition is due to the success in substituting a large amount of fluorine. A shrinking of the a lattice parameter caused by fluorine substitution is observed and the substitutional rate of fluorine changes at x = 0.16.

Original language	English
Article number	085023
Journal	Superconductor Science and Technology
Volume	26
Issue number	8
DOIs	https://doi.org/10.1088/0953-2048/26/8/085023
Publication status	Published - 2013 Aug

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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title = "Phase diagram and superconductivity at 58.1 K in α-FeAs-free SmFeAsO1-xFx",

abstract = "The phase diagram of SmFeAsO1-xFx in terms of x is exhibited in this study. Specimens of SmFeAsO1-xFx from x = 0 to x = 0.3 were prepared by low-temperature sintering with slow cooling. The low-temperature sintering suppresses the formation of the amorphous FeAs, which is inevitably produced as an impurity when using high-temperature sintering. Moreover, slow cooling is effective in obtaining a high fluorine concentration. The compositional change from feedstock composition is quite small after this synthesis. We can reproducibly observe a record superconducting transition for an iron-based superconductor at 58.1 K. This achievement of a high superconducting transition is due to the success in substituting a large amount of fluorine. A shrinking of the a lattice parameter caused by fluorine substitution is observed and the substitutional rate of fluorine changes at x = 0.16.",

author = "M. Fujioka and Denholme, {S. J.} and T. Ozaki and H. Okazaki and K. Deguchi and S. Demura and H. Hara and T. Watanabe and H. Takeya and T. Yamaguchi and H. Kumakura and Y. Takano",

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AU - Fujioka, M.

AU - Denholme, S. J.

AU - Ozaki, T.

AU - Okazaki, H.

AU - Deguchi, K.

AU - Demura, S.

AU - Hara, H.

AU - Watanabe, T.

AU - Takeya, H.

AU - Yamaguchi, T.

AU - Kumakura, H.

AU - Takano, Y.

PY - 2013/8

Y1 - 2013/8

N2 - The phase diagram of SmFeAsO1-xFx in terms of x is exhibited in this study. Specimens of SmFeAsO1-xFx from x = 0 to x = 0.3 were prepared by low-temperature sintering with slow cooling. The low-temperature sintering suppresses the formation of the amorphous FeAs, which is inevitably produced as an impurity when using high-temperature sintering. Moreover, slow cooling is effective in obtaining a high fluorine concentration. The compositional change from feedstock composition is quite small after this synthesis. We can reproducibly observe a record superconducting transition for an iron-based superconductor at 58.1 K. This achievement of a high superconducting transition is due to the success in substituting a large amount of fluorine. A shrinking of the a lattice parameter caused by fluorine substitution is observed and the substitutional rate of fluorine changes at x = 0.16.

AB - The phase diagram of SmFeAsO1-xFx in terms of x is exhibited in this study. Specimens of SmFeAsO1-xFx from x = 0 to x = 0.3 were prepared by low-temperature sintering with slow cooling. The low-temperature sintering suppresses the formation of the amorphous FeAs, which is inevitably produced as an impurity when using high-temperature sintering. Moreover, slow cooling is effective in obtaining a high fluorine concentration. The compositional change from feedstock composition is quite small after this synthesis. We can reproducibly observe a record superconducting transition for an iron-based superconductor at 58.1 K. This achievement of a high superconducting transition is due to the success in substituting a large amount of fluorine. A shrinking of the a lattice parameter caused by fluorine substitution is observed and the substitutional rate of fluorine changes at x = 0.16.

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Phase diagram and superconductivity at 58.1 K in α-FeAs-free SmFeAsO_1-xF_x

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