Magnetocapacitance effect and related microstrucuture in Ti-doped YMnO3
Magnetocapacitance effect and related microstrucuture in Ti-doped YMnO3
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DOI：
10.1103/physrevb.72.224434
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发表时间：
2005-12
影响因子：
3.7
通讯作者：
S. Mori;J. Tokunaga;Y. Horibe;Y. Aikawa;T. Katsufuji
中科院分区：
文献类型：
--
作者：
S. Mori;J. Tokunaga;Y. Horibe;Y. Aikawa;T. Katsufuji
利用电子衍射和实空间成像技术研究了Ti掺杂YMnO{sub 3}（YMn{sub 1-x}Ti{sub x}O{sub 3}）中引起磁电容效应的微结构。在x=0.175的化合物中发现了由于Mn三聚体的不稳定性导致的沿[110]方向沿着伸长的漫散射，表现出增强的磁电容效应。随着Ti浓度的增加，在x=0.20附近，中心对称（顺电）R3 c相以牺牲铁电P6{sub 3}cm相的代价生长，并且R3 c相在x=0.30以上占主导地位。我们目前的研究结果表明，Mn三聚体与短程相关的铁电纳米畴与10-20 nm的尺寸内应负责的磁电容的增强，另一方面，R3 c相的出现抑制了磁电容效应。
We have investigated microstructures giving rise to magnetocapacitance effect in Ti-doped YMnO{sub 3} (YMn{sub 1-x}Ti{sub x}O{sub 3}) by both electron diffraction and real-space imaging techniques. Diffuse scattering elongating along the [110] direction due to the instability of the Mn trimerization were found in the x=0.175 compound, which exhibits the enhanced magnetocapacitance effect. With increasing Ti concentration, the centrosymmetric (paraelectric) R3c phase grows up at the expense of the ferroelectric P6{sub 3}cm phase around x=0.20 and the R3c phase is dominant above x=0.30. Our present results indicate that the Mn trimers with the short-range correlation inside the ferroelectric nanodomains with the 10-20 nm size should be responsible for the enhancement of the magnetocapacitance and, on the other hand, the appearance of the R3c phase suppressed the magnetocapacitance effect.