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

    Abstract

    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
    Volume507
    Issue numberPART 1
    DOIs
    Publication statusPublished - 2014
    Event11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy
    Duration: 2013 Sep 152013 Sep 19

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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