On the dielectric susceptibility calculation in the incommensurate phase of K 2 SeO 4

Abstract

It is shown that the thermodynamic potential of the domain-like incommensurate (IC) phase of the K2SeO4 crystal (viewed as a model for the IC-C transition) should be supplemented with a term, taking into account the local, Lorentz electric field. The latter qualitatively changes the result of calculation of the dielectric susceptibility for this IC structure by Nattermann and Trimper, J. Phys. C: Solid State Phys. 14, 1603, (1981), and gives phase transition to the ferroelectric IC phase obtained by Aslanyan, Phys. Rev. B 70, 024102, (2004).