Illustration: Alan Stonebraker, adapted from [11]

Figure 1: Phase diagram for $Ba(Fe1-xCox)2$. Yellow indicates the superconducting phase, which appears below the superconducting transition temperature $Tc$. A structural transition occurs at $Ts$ from the tetragonal phase (Tet) at higher temperature to the orthorhombic phase (Ort). Blue represents the antiferromagnetic order (AFM), which appears at $TN$, slightly below $Ts$ for finite $x$. The stripes of enhanced superfluid density are observed only in the regime $0.04.