The role of silver addition on the structural and superconducting properties of polycrystalline Sr0.6K0.4Fe2As2
Lei Wang, Yanpeng Qi, Xianping Zhang, Zhaoshun Gao, Dongliang Wang,, Yanwei Ma
TL;DR
This study investigates how adding silver to Sr0.6K0.4Fe2As2 superconductors enhances their grain structure and magnetic properties without lowering the critical temperature, leading to improved superconducting performance.
Contribution
It demonstrates that silver addition improves grain size and connectivity in Sr0.6K0.4Fe2As2 superconductors, enhancing magnetic properties without reducing Tc.
Findings
Larger grains observed with Ag addition
Enhanced irreversibility field and hysteresis magnetization
Suppression of glassy phase and amorphous layers at grain boundaries
Abstract
The effect of Ag addition (0-20 wt%) on polycrystalline Sr0.6K0.4Fe2As2 superconductor has been investigated. It is found that the critical transition temperature Tc was not depressed, and the irreversibility field Hirr and hysteresis magnetization were significantly enhanced upon Ag addition. Characterization study reveals that larger grains are observed in the Ag-added samples. Moreover, the formation of glassy phase as well as amorphous layer, which are present in almost all the grain edges and boundaries in pure samples, are suppressed by Ag addition. The improvement of superconducting properties in Ag-added samples may originate from the enlargement of grains as well as better connections between grains
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