Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals. (January 2015)

• Record Type: Journal Article
• Authors: Kim, Jeehoon; Haberkorn, N.; Gofryk, K.; Graf, M.J.; Ronning, F.; Sefat, A.S.; Movshovich, R.; Civale, L.
• Is Part Of: Solid state communications. Volume 201(2015)
• Page Start: 20
• Page End: 24
• Publication Date: 2015-01
• Subjects: A. Iron arsenide superconductors -- B. Upper critical field -- C. Magnetic penetration depth -- D. Vortex pinning; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2014.09.016
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1− x Co x )2 As2 ( 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 λ ab (0)=660±50 nm, coherence length ξ ab (0)=6.4±0.2 nm, and the upper critical field anisotropy γ T → Tc ≈3.7. 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.