Latent heat of a temperature-dependent cubic-quartic Landau transition
= Latent heat of a temperature-dependent cubic-quartic Landau transition
{title2=$L=c(1-\gamma)(T^*)^2(\phi^*)^2$}
At an equilibrium minimum, $dF_{\min}/dT=\partial_TF$ because $\partial_\phi F=0$. For $0<\gamma<1$, the <entropy> decrease at coexistence is $S_0-S_+=c(1-\gamma)T^*(\phi^*)^2$. Multiplying by $T^*$ gives the positive <latent heat> released on cooling. The units are total heat or heat density according to the normalization of $F$.