ALT Illustration taken from the open access article showing Figure 3. (a) Plot of the RG flow for the Heisenberg and hopping terms. Paths I, II, III in (a) indicate the three types of phase diagram that can be accessed from the RG equations. (b): three possible distinct types of phase diagrams (I, II, III) corresponding to paths (I, II, III) from the RG flow diagram in (a). TN, T ∗ , and TFL denote the temperature crossovers for the anti-ferromagnetic order, pseudogap, and FL states, respectively. In (b)-I, δc and δc2 represent the critical points associated respectively with PSG-SM and SM-FL transitions once superconductivity is suppressed.

ALT portrait of Émilie Du Châtelet by Maurice Quentin de la Tour. Source: Public Domain via Wikimedia Commons.