Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2

Details Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2 Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2

2008-07-24

arxiv.org/abs/0807.3786v3

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.

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