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Short and long range impurity-induced polar ordering in Sr1-xCaxTiO3 with x =0.014 (SCT-1.4) and SrTi(16O0.0318O0.97)3 (STO-18) single crystals wereinvestigated and discussed on the basis of the light refraction temperaturedependences measurements. For SCT-1.4 the temperature dependences of themorphic birefringence and dielectric hysteresis loops were measured. Within theoptical indicatrix perturbation approach a method for calculation from polarcontributions to the refraction of light of short-range polarizationcontribution Psh originated by spatial fluctuations is developed for thesystems with the coexistence of long and short range polar ordering. Themagnitudes and temperature dependences of Psh and long-range spontaneouspolarization Ps have been determined in SCT-1.4 and STO-18. The results allowedto characterize quantitatively and to compare contributions of short (Psh) andlong (Ps) range ordering in the formation of impurity-induced polar phase inSrTiO3.

Impurity-induced Polar States in SrTiO3 Quantum Paraelectric