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Heat treatment effects on the superconducting properties of Ag-doped SrKFeAs compound

The superconducting properties of polycrystalline Sr0.6K0.4Fe2As2 were strongly influenced by Ag doping (Supercond. Sci. Technol. 23 (2010) 025027). Ag addition is mainly dominated by silver diffusing, so the annealing process is one of the essential factors to achieve high quality Ag doped Sr0.6K0.4Fe2As2. In this paper, the optimal annealing conditions were studied for Ag doped Sr0.6K0.4Fe2As2 bulks prepared by a one-step solid reaction method. It is found that the annealing temperature has a strong influence on the superconducting properties, especially on the critical current density Jc. As a result, higher heat treatment temperature (~900C) is helpful in diffusing Ag and reducing the impurity phase gathered together to improve the grain connectivity. In contrast, low-temperature sintering is counterproductive for Ag doped samples. These results clearly suggest that annealing at ~900C is necessary for obtaining high Jc Ag-doped samples.

preprint2010arXivOpen access
Zhiyu ZhangLei WangYanpeng QiZhaoshun GaoDongliang WangXianping ZhangYanwei Ma
cond-mat.supr-con
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Open access7 authors1 topic
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Zhiyu ZhangLei WangYanpeng QiZhaoshun GaoDongliang WangXianping ZhangYanwei Ma

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