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Multistep coupling of preexisting local ferroic distortions in PbTiO<sub>3</sub> above the Curie temperature.
Journal of Physics. Condensed Matter : An Institute of Physics Journal 2018 September 22
Temperature-dependent Raman spectroscopic analyses were performed for the prominent ferroelectric PbTiO<sub>3</sub> in the temperature range 130-1040 K, focusing particularly on its paraelectric state above the Curie temperature T<sub>C</sub> ~763 K. The temperature evolution of the anomalous Raman scattering reveals that not only local ferroic distortions persist at temperatures well above T<sub>C</sub>, but also there is a sequence of different coupling processes preceding the appearance of long-range ferroelectric order at T<sub>C</sub>. Our results indicate that, similar to relaxor ferroelectrics, the paraelectric phase of PbTiO<sub>3</sub> can be considered as an ergodic system of local ferroic distortions, which only on average appears to have cubic symmetry.
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