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Smeared transitions into low-T domain states are evidenced by linear birefringence measured on sr1-xCaxTiO3 at all concentrations, 0.002<x<0.058. Sharp ϵ′ vs T peaks, as observed for x<0.016, may be explained by domains having nearly sample size. The local disorder due to the Ca2+-induced random fields may partially be removed by a uniform external electricfield.
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Kleemann et al. (1988) studied this question.
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