Physics – Condensed Matter – Superconductivity
Scientific paper
2011-01-28
Appl. Phys. Lett. 98, 042508 (2011)
Physics
Condensed Matter
Superconductivity
13 pages, 4 figures
Scientific paper
Phase-pure polycrystalline Ba0.6K0.4+xFe2As2 with were prepared using a one-step solid-state reaction method. We found that over-doping of potassium can improve critical current density (Jc). High-field Jc for samples with x = 0.1 is three times higher than that for samples with x = 0. Over-doping 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. 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 over-doping can promote intra-grain Jc. Our results indicate that slight excess of K in Ba0.6K0.4Fe2As2 samples is beneficial to high-field applications.
Gao Zhaoshun
Ma* Yanwei
Qi Yanpeng
Wang Chun-lei
Wang Dongliang
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