Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-24
Appl. Phys. Lett. 93, 142506 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures
Scientific paper
10.1063/1.2996576
By measuring the magnetization hysteresis loops of superconducting Ba0.6K0.4Fe2As2 single crystals, we obtained the high upper critical field and large current carrying ability, which point to optimistic applications. The fishtail (or second peak) effect is also found in the material, and the position of the vortex pinning force shows a maximum at 1/3 of the reduced field, being consistent with the picture of vortex pinning by small size normal cores in the sample. Together with the resistive measurements, for the first time the vortex phase diagram is obtained for superconductor Ba0.6K0.4Fe2As2.
Luo Hui-qian
Wang Zhaosheng
Wen Hai-hu
Yang Huan
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