Figure 1
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<x<0.06.