  The critical current density has been measured on single crystals of Ru
substituted BaFe2As2 superconductor at several temperatures and in fields up to
16 T. The magnetisation versus field isotherms reveal the occurrence of a clear
second magnetisation peak (SMP) also known as fish-tail effect for both H
parallel and perpendicular to c-axis of the crystal. The in-field resistance
and magnetisation data are used to put forth a vortex phase diagram. The nature
of the vortices have been determined from scaling behaviour of the pinning
force density extracted from the Jc-H isotherms. The scaled JC versus reduced
temperature behaviour seems to fit to a power law that indicates unambiguously
that pinning in this system arises due to the spatial variation in the mean
free path, viz. delta-l pinning.
