Multicritical even Landau potential
= Multicritical even Landau potential
{title2=$r\phi^2/2+\lambda_n\phi^{2n}$}
For $n\geq2$ and $\lambda_n>0$, this <Landau free energy> has <mean-field critical exponents> $\beta=1/[2(n-1)]$ and $\alpha=(n-2)/(n-1)$ when $r$ crosses zero linearly with <temperature>. For $n>2$, obtaining this behavior requires tuning the lower even interactions to zero.