On the dielectric susceptibility calculation in the incommensurate phase of K_2SeO_4

Details On the dielectric susceptibility calculation in the incommensurate phase of K_2SeO_4 On the dielectric susceptibility calculation in the incommensurate phase of K_2SeO_4

2005-02-26

arxiv.org/abs/cond-mat/0502637v1

Physics

Condensed Matter

Materials Science

5 pages, 1 figure

Scientific paper

It is shown that the thermodynamic potential of the domain-like incommensurate (IC) phase of the K_2SeO_4 crystal 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).

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