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Enhanced critical current properties in Ba0.6K0.4+xFe2As2 superconductor by overdoping of potassium

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8 Author(s)
Wang, Chunlei ; Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, P.O. Box 2703, Beijing 100190, People’s Republic of China ; Wang, Lei ; Gao, Zhaoshun ; Yao, Chao
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Phase-pure polycrystalline Ba0.6K0.4+xFe2As2 with 0≤x≤0.1 were prepared using a one-step solid-state reaction method. We found that overdoping of potassium can improve the critical current density (Jc). High-field Jc for samples with x=0.1 is three times higher than that for samples with x=0. Overdoping of K has minimal effect on the critical transition temperature (Tc). Less than 0.5 K degradations in Tc was measured for samples with x=0.1. Transmission electron microscopy (TEM) revealed high concentration of dislocations in samples with x=0.1, resulting in enhanced flux pining. Further analyses on magnetization loops for powder samples confirm that K overdoping can promote intragrain Jc. Our results indicate that slight excess of K in Ba0.6K0.4Fe2As2 superconductor is beneficial to high-field applications.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 4 )

Date of Publication:

Jan 2011

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