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We discuss the irreversible magnetic properties of self-flux grownBa(Fe1-xCox)2As2 single crystals for a wide range of concentrations coveringthe whole phase diagram from the underdoped to the overdoped regime, x=0.038,0.047, 0.058, 0.071, 0.074, 0.10, 0.106 and 0.118. Samples were characterizedby a magneto-optical method and show excellent spatial uniformity of thesuperconducting state. The overall behavior closely follows classical Beanmodel of the critical state. The field-dependent magnetization exhibits secondpeak at a temperature and doping - dependent magnetic field, Hp. The evolutionof this fishtail feature with doping is discussed. Magnetic relaxation istime-logarithmic and unusually fast. Similar to cuprates, there is an apparentcrossover from collective elastic to plastic flux creep above Hp. At highfields, the field dependence of the relaxation rate becomes doping independent.We discuss our results in the framework of the weak collective pinning and showthat vortex physics in iron-based pnictide crystals is much closer to high-Tccuprates than to conventional s-wave (including MgB2) superconductors.

Doping dependent Irreversible Magnetic Properties of Ba(Fe1-xCox)2As2 Single Crystals