Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-00984-1, published online 19 April 2017

In Figure 6B, the vertical Jc scale is incorrect. The correct Figure 6 appears below as Figure 1.

Figure 1
figure 1

The increase in superconducting critical current density (Jc) for annealed optimally-doped Ba(Fe1−xCox)2 As2 crystal. For x = 0.063 and as-grown (in black) and annealed (in red) crystals, (a) field dependence of critical current density (Jc) below Tc, and (b) temperature dependence of Jc at 0.2 Tesla.