The temperature dependence of the principal values of the refractive index in Sr 1− x Ca x TiO 3 ( x =0.014) has been measured in the 17–275 K range under various conditions of sample illumination with 1.96 eV photons. The spontaneous photorefractive contribution δn ph to the temperature-induced variation of the refractive index of Sr 1− x Ca x TiO 3 , which appears after illumination of the sample in the ferrophase (transition temperature T c =32 K) and persists in the paraphase under heating up to 150 K, has been separated. The photoinduced polarization has been estimated.
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Guzhva et al. (1997) studied this question.
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