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

JEEHOON KIM; N. HABERKORN; K. GOFRYK; M. J. GRAF; F. RONNING; A. S. SEFAT; R. MOVSHOVICH; L. CIVALE

SOLID STATE COMMUNICATIONS

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2015 vol. 201 p. 20 - 24

0038-1098

We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1-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 = 660 ± 50 nm,  a coherence length = 6.4 ± 0.2, and a upper critical field anisotropy 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.