$J_{\rm c}$ Scaling and Anisotropies in Co-Doped Ba-122 Thin Films

We have successfully grown epitaxial, superconducting films of Ba(Fe_1-xCo_x)₂As₂ (Ba-122)with x ~ 0.1. The films grow without observable correlated defects parallel to the c-axis, as confirmed by TEM. This is also reflected in the absence of a c-axis peak in J_c(θ). In contrast to cuprate high-T_c superconductors such as YBa₂Cu₃O_7-δ or even Bi₂Sr₂Ca₂Cu₃O_10-δ, the pnictides show a rather low anisotropic behavior in their J_c(θ) behavior as well as in their upper critical fields, H_c2. As a multiband superconductor, Ba-122 exhibits a temperature dependent electronic mass anisotropy.