Figure 8. LSCO phase diagram, showing several VHS-related crossovers and regions where the susceptibility peaks at different q-vectors.

Dominant fluctuations are at commensurate (π, π) (white shaded region) or incommensurate (π, π − δ) (green shaded region); crossovers are T_VHS (red short-dashed line), DOS peak (green long-dashed line), coherent-incoherent crossover (pink shaded region), T_γ (violet dot-dashed curve), and the position of the (π, π) peak vs doping (light blue dot-dashed line). Experimental pseudogaps from ref. 9 (yellow-green solid line and brown dashed line) and ref. 51 (magenta dotted line). Recall, from Fig. 3, that x₀ is the doping at T = 0, but we assume .