Abstract
A new mechanism of incommensurate (INC) phase transition will be mentioned. The INC phase may be stabilized by freezing of a soft mode on the [k, k, 0] or [k, k, 1/2] branch induced by the parabolic splitting of the doubly degenerate modes at the Brillouin zone boundary (1/2, 1/2, 0) or (1/2, 1/2, 1/2). A simple model theory of the incommensurate phase transition of this type is proposed, which easily reproduces a special feature for the INC phase that the macroscopic symmetry changes at the INC phase transition.
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