Figure 4
From: Dynamics and mechanism of oxygen annealing in Fe1+yTe0.6Se0.4 single crystal
STM images for (a) as-grown, (b) – (c) O2-annealed Fe1+yTe0.6Se0.4 single crystal. The bright spots in (a) correspond to the excess Fe, which disappear in the optimally-annealed crystal.
