Figure 4: Expansion of the temperature-dependent GL free energy.
From: Coexistence of charge and ferromagnetic order in fcc Fe

Plots showing the results of an expansion of the GL free energy F to the fourth ((a) parameters: a=0.9, a′=1, TP=130, TC′=100, b=2.4, b′=0.9, γ=1.4, c=c′=0) and to the sixth power ((b) same parameters, except for c=c′=0.015), as described in equations (1) and (2), respectively.