  In this work we report the influence of intrinsic superconducting parameters
on 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, coherence
length $\xi_{ab}$(0) = 5 nm, and the upper critical field anisotropy
$\gamma_{T\rightarrow Tc}$ $\approx$ 3.7. In fact, the Ginzburg-Landau model
may explain the angular dependent $H_{c2}$ for this anisotropic
three-dimensional superconductor. The vortex phase diagram, in comparison with
the optimally doped compound, presents a narrow collective creep regime. In
addition, we found no sign of correlated pinning along the c axis. Our results
show that vortex core to defect size ratio and $\lambda$ play an important role
in the resulting vortex dynamics in materials with similar intrinsic thermal
fluctuations.
