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In this work we report the influence of intrinsic superconducting parameterson the vortex dynamics in an overdoped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ (x=0.14)single crystal. We find a superconducting critical temperature of 13.5 K,magnetic penetration depth $\lambda_{ab}$(0) = 660 $\pm$ 50 nm, coherencelength $\xi_{ab}$(0) = 5 nm, and the upper critical field anisotropy$\gamma_{T\rightarrow Tc}$ $\approx$ 3.7. In fact, the Ginzburg-Landau modelmay explain the angular dependent $H_{c2}$ for this anisotropicthree-dimensional superconductor. The vortex phase diagram, in comparison withthe optimally doped compound, presents a narrow collective creep regime. Inaddition, we found no sign of correlated pinning along the c axis. Our resultsshow that vortex core to defect size ratio and $\lambda$ play an important rolein the resulting vortex dynamics in materials with similar intrinsic thermalfluctuations.

Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe$_{0.86}$Co$_{0.14}$)$_2$As$_2$ single crystal