Influence of shear stress $σ_6$ on the phase transition and physical properties of KD2PO4 type ferroelectrics

Details Influence of shear stress $σ_6$ on the phase transition and physical properties of KD2PO4 type ferroelectrics Influence of shear stress $σ_6$ on the phase transition and physical properties of KD2PO4 type ferroelectrics

1999-11-23

arxiv.org/abs/cond-mat/9911370v2

Physics

Condensed Matter

38 pages, LaTeX2e, 22 figures, typos corrected

Scientific paper

Within the four-particle cluster approximation for the proton ordering model we study the influence of shear stress $\sigma_6$ on the phase transition, static dielectric, elastic and thermal properties of deuterated KD2PO4 type ferroelectrics. Thermodynamic potentials and physical characteristics of the crystals in the presence of stress $\sigma_6$ are calculated. Numerical analysis of the obtained results is performed, and the set of the theory parameters providing the best fit to the available experimental data is found. The $Tc-\sigma_6$ phase diagram is constructed; temperature dependences of the calculated quantities are studied, possible stress dependences are indicated. Influence of $\sigma_6$ stress is analogous to that of electric field conjugate to the order parameter.

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