Abstract
The influence of hydrostatic stress on phase transitions of a ``Lifshitz type-I'' system is discussed. Taking into account third- and fifth-order coupling terms between the order parameter and the strains, we show that the two lowest-order terms in the Landau free-energy expansion are both pressure dependent. Within the ``phase-modulation-only'' approximation, a formula is derived, which gives the shift of the lock-in transition temperature under the effect of a stress. A numerical comparison with the Clausius-Clapeyron relation is shown.
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