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Fishtail effect and the vortex phase diagram of single crystal
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View: Figures


Image of FIG. 1.
FIG. 1.

Temperature dependence of resistivity at various fields of 0, 1, 3, 5, 7, and (from right to left) of the single crystal. The inset shows the temperature dependence of the superconducting diamagnetic moment measured in the ZFC and FC processes at a field of .

Image of FIG. 2.
FIG. 2.

MHLs at the temperatures (a) from with an interval of , and at (b) 2, 5, 10, 15, 20, and . Fishtail effect appears in the high field region.

Image of FIG. 3.
FIG. 3.

Field dependence of the calculated critical current density from the Bean critical state model at the temperatures corresponding to all the curves in Fig. 2.

Image of FIG. 4.
FIG. 4.

The correlation between the normalized pinning force and the reduced field . The maximum peak locates at the position , which is predicted by the theory for the small size normal core pinning.

Image of FIG. 5.
FIG. 5.

The phase diagram of the single crystal. The solid symbols are taken from the magnetic measurements (the inset shows the schematic of the definitions of the characteristic parameters), while the open ones are taken from the resistive measurements. The solid lines show the fitting results to the and curves.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2