Ferroelectricity and giant magnetocapacitance in perovskite rare-earth manganites
Ferroelectricity and giant magnetocapacitance in perovskite rare-earth manganites
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DOI：
10.1103/physrevlett.92.257201
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发表时间：
2004-06-25
影响因子：
8.6
通讯作者：
Tokura, Y
中科院分区：
文献类型：
--
作者：
Goto, T;Kimura, T;Tokura, Y
研究了RMnO_3(R=Eu，Gd，Tb，Dy)的磁性、晶格调制和介电性能之间的关系。这些化合物在Neel温度以下表现出向无公度晶格结构的转变，随后经历了无公度-公度(IC-C)相变。对于TbMnO_3和DyMnO_3，发现IC-C相变伴随着铁电相变，并伴随着C相中的晶格调制。DyMnO_3显示出巨大的磁电容，介电常数的变化高达Deltaepsilon/epsilon，类似于500%。
The relationships among magnetism, lattice modulation, and dielectric properties have been investigated for RMnO3 (R=Eu, Gd, Tb, and Dy). These compounds show a transition to an incommensurate lattice structure below their Neel temperature, and subsequently undergo an incommensurate-commensurate (IC-C) phase transition. For TbMnO3 and DyMnO3 it was found that the IC-C transition is accompanied by a ferroelectric transition, associated with a lattice modulation in the C phase. DyMnO3 shows a gigantic magnetocapacitance with a change of dielectric constant up to Deltaepsilon/epsilonsimilar to500%.