Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals

Abstract

Detailed measurements of the global and local electromagnetic properties of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ single crystals are reported. Analysis of the irreversible magnetic response provides strong evidence for similar vortex physics in this Fe-based pnictide superconductor to the high-$T_c$ cuprates, such as Y-Ba-Cu-O or Nd-Ce-Cu-O. In particular, we have found a nonmonotonic "fishtail" magnetization in $M(H,T=const)$ loops and its signature is also present in $M(H=const,T)$ scans. The supercurrent density is evaluated by using several techniques, including direct transport measurements. At 5 K we estimate its value to be a moderate $j\approx 2.6\pm 0.2\times 10^5$ A/cm${}^2$. Analysis of the magnetic relaxation is consistent with the collective pinning and creep models (weak pinning and fast creep) and suggests a crossover from the collective to the plastic creep regime in fields exceeding the value corresponding to the maximum in fishtail magnetization.

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