Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 26, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/26/8/085023
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Funding
- Japan Society for the Promotion of Science through 'Funding Program for World-Leading Innovative R&D on Science Technology Program (FIRST)'
- Japan Science and Technology Agency through Strategic International Collaborative Research Program (SICORP-EU-Japan)
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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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