Title: Electric field induced polarization rotation in squaric acid crystals revisited
Author(s):

A. P. Moina (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine)

Using the previously developed model we revisit the problem of the electric field induced polarization rotation in antiferroelectric crystals of squaric acid. We test an alternative set of the model parameters, according to which the dipole moments associated with the H₂C₄O₄ groups are assumed to be parallel to the diagonals of the ac plane. The T-E phase diagrams and the polarization curves P(E) for the fields directed along the a axis and along one of the diagonals are considered. Comparison of the theoretical results with the newly published experimental data confirm the validity of the model. The calculations reveal no apparent advantage of the new set of the parameters over the previously used set.

Key words: polarization, electric field, phase transition, phase diagram, squaric acid

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