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

Abstract

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.

4 pages, 5 figures

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• Evidence for Supercurrent Connectivity in Conglomerate Particles in NdFeAsO1-d

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• Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication
• Evolution of Critical Current Density in CaKFe${}_4$As${}_4$ with La-doping
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• Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba${}_{0.64}$K${}_{0.36}$Fe${}_2$As${}_2$
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