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Kim, J., N. Haberkorn, K. Gofryk, M. J. Graf, F. Ronning, A. S. Sefat, R. Movshovich, and L. Civale. "Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals." Solid State Communications 201 (2015): 20–24.
We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1âˆ’xCox)2As2 (x=0.14) single crystal and their influence in the resulting vortex dynamics. We find a bulk superconducting critical temperature of 9.8 K, magnetic penetration depth Î»ab (0)=660Â±50 nm, coherence length Î¾ab (0)=6.4Â±0.2 nm, and the upper critical field anisotropy Î³Tâ†’Tcâ‰ˆ3.7. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. The intrinsic pinning energy plays an important role in the resulting vortex dynamics as compared with similar pinning landscape and comparable intrinsic thermal fluctuations.