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

Jeehoon Kim; N. Haberkorn; K. Gofryk; M. J. Graf; L. Civale; F. Ronning; A. S. Sefat; R. Movshovich

doi:10.1016/j.ssc.2014.09.016

paper

Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe $_{0.86}$ Co $_{0.14}$ ) $_{2}$ As $_{2}$ single crystal

arXiv:1302.0074 · doi:10.1016/j.ssc.2014.09.016

Abstract

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 $λ_{ab}$ (0) = 660 $\pm$ 50 nm, coherence length $ξ_{ab}$ (0) = 5 nm, and the upper critical field anisotropy $γ_{T \to T c}$ $\approx$ 3.7. In fact, the Ginzburg-Landau model may explain the angular dependent $H_{c 2}$ 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 $λ$ play an important role in the resulting vortex dynamics in materials with similar intrinsic thermal fluctuations.

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Universal Lower Limit on Vortex Creep in Superconductors

Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe0.86​Co0.14​)2​As2​ single crystal

Abstract

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Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe $_{0.86}$ Co $_{0.14}$ ) $_{2}$ As $_{2}$ single crystal