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Magnetization and its relaxation have been measured on Ba0.6K0.4Fe2As2 singlecrystals with Tc = 39 K. The magnetization hysteresis loops (MHLs) exhibit fluxjumps in the low temperature region, and a second peak-effect in theintermediate temperature region, especially when the field sweeping rate islow. Interestingly a third magnetization peak can be easily observed on theMHLs in the high temperature region. Further analysis find that the firstmagnetization peak is very sharp, which is associated with the strong vortexpinning. However the first dip of the MHL corresponds to a moderate relaxationrate, then a second peak appears accompanied by a vanishing vortex motion.Finally a third magnetization peak emerges and the vortex motion becomesdrastic beyond this threshold. The novel features accompanying the secondmagnetization peak suggest a new type of vortex phase transition.

Multiple Magnetization Peaks and New Type of Vortex Phase Transitions in Ba0.6K0.4Fe2As2