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Deuteration Dependence of the Central Peak in KDP‐Type Ferroelectrics
Author(s) -
Wesselinowa Julia M.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221390133
Subject(s) - ferroelectricity , condensed matter physics , soft modes , mode (computer interface) , transverse field , materials science , type (biology) , character (mathematics) , spin (aerodynamics) , ising model , transverse plane , field (mathematics) , spectral line , nuclear magnetic resonance , physics , thermodynamics , mathematics , quantum mechanics , geometry , optoelectronics , ecology , structural engineering , engineering , biology , computer science , dielectric , pure mathematics , operating system
The Ising model in a transverse field is treated by means of the Green's function technique to calculate the dynamical structure factor below and above T c in KDP‐ and DKDP‐type ferroelectrics. Deuteration causes a decreasing in the frequency of the soft‐ferroelectric mode and an increasing in the spin—spin damping. The underdamped character of the soft mode disappears on deuteration. In KD 2 PO 4 the peak around the soft mode is absent and the ferroelectric mode spectra below and above T c consist only of the central peak around E = 0. All obtained results are in very good agreement with the experimental data.