期刊
PHYSICAL REVIEW LETTERS
卷 100, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.227601
关键词
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We report the anomalous phase evolution in ferroelectric single crystals Ba(1-x)Ca(x)TiO(3) (0.02 < x < 0.34), and demonstrate the significant effects of quantum fluctuation on the ferroelectric phase transition. In addition, large electromechanical responses in this class of crystals are also demonstrated. Our results indicate that an effective approach to control the ferroelectricity of perovskite oxide can be realized not only by the covalency between A site atom and oxygen but also by the substitution of A site with small ions with off-centering nature. Theoretical calculations support the idea that the off-center displacements of the smaller Ca ions in the Ba-site play an important role in the exotic natures of Ba(1-x)Ca(x)TiO(3).
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