Delicate balance between ferroelectricity and antiferroelectricity in hexagonal InMnO3
Delicate balance between ferroelectricity and antiferroelectricity in hexagonal InMnO3
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DOI：
10.1103/physrevb.87.184109
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发表时间：
2013-03
影响因子：
3.7
通讯作者：
F. Huang;Xueyun Wang;Y. Oh;K. Kurushima;S. Mori;Y. Horibe;S. Cheong
中科院分区：
文献类型：
--
作者：
F. Huang;Xueyun Wang;Y. Oh;K. Kurushima;S. Mori;Y. Horibe;S. Cheong
六方晶系InMnO${}_{3}$中是否存在铁电性一直备受争议。我们的低温（$T$）极化、透射电子显微镜和高角度环形暗场扫描TEM对良好控制的InMnO${}_{3}$的综合实验结果表明，基态是具有$P $6 ${}_{3}$$\mathit{cm}$对称性的铁电体，但在高T时存在非铁电P c 1态，并可淬灭到室温。我们发现，竞争的铁电和反铁电相共存的介观尺度，可以通过不同的热处理有意控制。
The presence of ferroelectricity in hexagonal InMnO${}_{3}$ has been highly under debate. The results of our comprehensive experiments of low-temperature ($T$) polarization, transmission electron microscopy, and high-angle annular dark-field scanning TEM on well-controlled InMnO${}_{3}$ reveal that the ground state is ferroelectric with $P$6${}_{3}$$\mathit{cm}$ symmetry, but a nonferroelectric $P$$\overline{3}$$c$1 state exists at high $T$ and can be quenched to room temperature. We found that the competing ferroelectric and antiferroelectric phases coexist in mesoscopic scales and can be deliberately controlled by varying thermal treatments.