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Effect of the indium addition on the superconducting property and the impurity phase in polycrystalline SmFeAsO1-xFx

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arxiv 1210.5714 v1 pith:WHKAB3GI submitted 2012-10-21 cond-mat.supr-con

Masaya Fujioka , Toshinori Ozaki , Hiroyuki Takeya , Keita Deguchi , Satoshi Demura , Hiroshi Hara , Tohru Watanabe , Denholme Saleem James
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Hiroyuki Okazaki Takahide Yamaguchi Hiroaki Kumakura Yoshihiko Takano
This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductingamorphousareasgrainsindiumpolycrystallinesmfeaso1-xfxaddition
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We report enhancement in the magnetic critical current density of indium added polycrystalline SmFeAsO1-xFx. The value of magnetic Jc is around 25 kA/cm2 at 4.2 K under self-magnetic field. Polycrystalline SmFeAsO1-xFx is mainly composed of the superconducting grains and a little of amorphous FeAs compounds. These areas randomly co-exist and amorphous areas are located between superconducting grains. Therefore, the superconducting current is prevented by the amorphous areas. In this study, it is found that indium addition to polycrystalline SmFeAsO1-xFx removes these amorphous areas and induces the bringing together the superconducting grains. It means the total contact surfaces of grains are increased. We suggest that the enhancement of the magnetic critical current density is a direct effect of the indium addition.

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