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.
|Journal||Journal of Physics: Conference Series|
|Issue number||PART 1|
|Publication status||Published - 2014|
|Event||11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy|
Duration: 2013 Sep 15 → 2013 Sep 19
ASJC Scopus subject areas
- Physics and Astronomy(all)