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VOLUME 23 (1976) | ISSUE 5 | PAGE 244
Influence of collective modes on the order of the phase transition
It is shown that the contribution made to the system energy by the zero-point oscillations of the order parameter near the phase-transition point determines essentially the order of the phase transition. For example, in the case of a structure phase transition, such an oscillation is a soft phonon mode, with which the lattice instability is connected and which vanishes only at the transition point. This behavior of the branch of the collective excitations leads to a first-order phase transition.