Anomalous phase diagram of ferroelectric (Ba,Ca)TiO3 single crystals with giant electromechanical response

被引：143

作者：

Fu, Desheng ^{[1
,2
]}

Itoh, Mitsuru ^{[2
]}

Koshihara, Shin-ya ^{[1
,3
,4
,5
]}

Kosugi, Taichi ^{[6
]}

Tsuneyuki, Shinji ^{[6
]}

机构：

[1] Japan Sci & Technol Agcy, ERATO, Chiyoda Ku, Tokyo 1020075, Japan

[2] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[3] Tokyo Inst Technol, Frontier Res Ctr, Meguro Ku, Tokyo 1528551, Japan

[4] Tokyo Inst Technol, Dept Mat Sci, Meguro Ku, Tokyo 1528551, Japan

[5] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan

[6] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.100.227601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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).

引用

页数：4

共 28 条

[1] SR1-XCAXTIO3 - AN XY QUANTUM FERROELECTRIC WITH TRANSITION TO RANDOMNESS [J].