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Phase transition and random-field induced domain wall response in quantum ferroelectrics SrTi~(18)O_3: review and perspective

机译:量子铁电体SrTi〜(18)O_3中的相变和随机场感应畴壁响应:回顾与展望

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摘要

The oxygen isotope exchange of ~(16)O by ~(18)O in SrTiO_3 causes a drastic change from paraelectric to ferroelectric, due to the suppression of quantum fluctuation. The phase transition and origin of the huge domain wall response were evaluated by dielectric, magnetic (NMR), and optical measurements (SHG, light scattering). The results obtained corroborate (1) smeared ferroelectric transition at T_c due to quenched random field, (2) a quite large dielectric contribution from domain walls, (3) incomplete softening of the transverse optic mode, and (4) a large contribution from the relaxational mode to the phase transition. Quantitative explanations, given to individual results, may give hints to grasp the mechanism for the evolution of ferroelectricity, in which quantum fluctuation and random fields are dominant perturbations. Finally, some of the news studies on the SrTiO_3 were also introduced.
机译:由于抑制了量子涨落,SrTiO_3中的〜(18)O与〜(16)O的氧同位素交换导致了从顺电到铁电的急剧变化。通过介电,磁(NMR)和光学测量(SHG,光散射)评估了巨大畴壁响应的相变和起源。得到的结果证实了(1)由于淬灭的随机场而在T_c处涂抹了铁电跃迁,(2)畴壁的介电贡献很大,(3)横向光模的不完全软化,和(4)松弛模式到相变。对单个结果进行定量解释,可能会提示您掌握铁电演化的机理,其中量子涨落和随机场是主要扰动。最后,还介绍了有关SrTiO_3的一些新闻研究。

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