Abstract
It is shown in the large-n limit that axial anisotropy can induce a change-over from first-order to tricritical and second-order phase transitions in n-component s6 models with isotropic interactions as well as in Wallace's hypercubic s4 model (1973) with m=O(1) critical components. For m=O(n) one finds in the limit of large axial anisotropy an m-vector-like discontinuity of the order parameter at T1.
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