Physics – Condensed Matter – Superconductivity
Scientific paper
2010-04-13
SCIENCE CHINA: Physics, Mechanics & Astronomy, 53 (2010) 1187-1193
Physics
Condensed Matter
Superconductivity
18 pages, 7 figures; Science China G: Focused issue on Iron Pnictide superconductors, in press
Scientific paper
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.
Gao Zhaoshun
Ma* Yanwei
Qi Yanpeng
Wang Dongliang
Wang Lei
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