Title: LONGITUDINAL DIELECTRIC RELAXATION IN KD$_2$PO$_4$ UNDER HYDROSTATIC PRESSURE
Author(s): R.R.Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine), I.R.Zachek (State University ``Lvivska Polytekhnika'', 12 S.Bandera Str., 79013 Lviv, Ukraine), A.P.Moina, A.S.Duda (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine)

Within the model proposed earlier, we study the effect of hydrostatic pressure on relaxational dynamics of deuterated KD$_2$PO$_4$ type ferroelectrics. Within the four particle approximation for deuteron ordering model and using the Glauber approach, we calculate the longitudinal dynamic dielectric permittivity of the strained crystal. Possible pressure dependences of the permittivity and relaxation times are discussed.

Key words: KDP, hydrostatic pressure, dielectric relaxation, dynamic dielectric permittivity
PACS: 77.22.Gm, 77.84.Fa