抄録
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.
本文言語 | 英語 |
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論文番号 | 085023 |
ジャーナル | Superconductor Science and Technology |
巻 | 26 |
号 | 8 |
DOI | |
出版ステータス | 出版済み - 8月 2013 |
外部発表 | はい |