Bi- and tetracritical phase diagrams in three dimensions

A. Aharony, O. Entin-Wohlman, A. Kudlis

The critical behavior of many physical systems involves two competing $n_1^{}-$ and $n_2^{}-$component order-parameters, ${\mathbf{S}}_1^{}$ and ${\mathbf{S}}_2^{}$, respectively, with $n=n^…