Tricritical wing
= Tricritical wing
= Tricritical first-order wing
{synonym}
For an even sextic <Landau free energy> perturbed by a conjugate field, a tricritical wing is a <phase coexistence> surface at nonzero field between ordered minima of different magnitudes. Two symmetry-related wings emerge from the three-phase line at zero field and terminate at ordinary critical edges. They meet the zero-field ordered coexistence sheet at the <tricritical point>.