Amorphous FeAs-free SmFeAsO1-xFx using low temperature sintering with slow cooling

Masaya Fujioka, Saleem J. Denholme, Hiroyuki Okazaki, Keita Deguchi, Satoshi Demura, Hiroshi Hara, Hiroyuki Takeya, Takahide Yamaguchi, Hiroaki Kumakura, Yoshihiko Takano

Research output: Contribution to journalConference articlepeer-review


We obtained the highest superconducting transition temperature of SmFeAsO1-xFx at 58.1 K by using low temperature synthesis with slow cooling. We found that the low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces a high level of fluorine into oxygen site. By using this method, impurity phases are not formed up to x 0.16, and they gradually increase above x 0.16. However, the resistivity of the normal state continues to decrease and Tc onset gradually increases with increasing fluorine concentration even when x > 0.16. Therefore, it is suggested that the fluorine is gradually introduced into oxygen site above x 0.16.

Original languageEnglish
Article number012015
JournalJournal of Physics: Conference Series
Issue numberPART 1
Publication statusPublished - 2014
Externally publishedYes
Event11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy
Duration: 15 Sept 201319 Sept 2013


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