Abstract
Short- and long-range impurity-induced polar ordering in Sr1−xCaxTiO3 (x = 0.014) single crystals was investigated and discussed on the basis of light refraction, morphic birefringence and temperature-dependent dielectric hysteresis loop measurements. A new method for the calculation of the short-range polar order contribution Psh in ferroelectric (FE) phases below TC from light refraction measurements was applied. This method considers optical indicatrix perturbation due to polar ordering taking into account polarization fluctuations. The magnitudes and temperature dependences of Psh originated by spatial fluctuations and long-range spontaneous polarization Ps were determined. These results allowed us to obtain quantitatively and to compare short (Psh)- and long (Ps) range polar order contributions to the formation of impurity-induced FE phase in quantum paraelectrics.
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