EFFECT OF THE LONGITUDINAL MAGNETIC FIELD AND HYDROSTATICAL PRESSURE ON THE FERROELECTRICS FAMILY OF KD₂ PO₄

Alla Moina (Personal webpage)

A microscopic model of the influence of the conjugate to the order parameter external fields-electric field E₃ and shear stress σ₆ -on deuterated KD₂ PO₄ -type ferroelectrics is presented. The major mechanisms for this influence are the splitting of the Slater-Takagi energies of the short-range correlations and the effective field created by piezoelectric coupling with shear strain σ₆. The T_c vs σ₆ phase diagram of KD₂ PO₄ is constructed, and the stress dependences of the dielectric, piezoelectric, and elastic characteristics associated with strain σ₆ are discussed.