Unusual tunability of multiferroicity in GdMn2O5 by electric field poling far above multiferroic ordering point
Unusual tunability of multiferroicity in GdMn2O5 by electric field poling far above multiferroic ordering point
复制标题
通过远高于多铁性排序点的电场极化对 GdMn2O5 中的多铁性进行异常可调
DOI：
10.1088/1674-1056/28/2/027502
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发表时间：
2019
影响因子：
1.7
通讯作者：
Liu Junming
中科院分区：
文献类型：
--
作者：
Li Xiang;Zheng Shuhan;Tian Liman;Shi Rui;Liu Meifeng;Xie Yunlong;Yang Lun;Zhao Nian;Lin Lin;Yan Zhibo;Wang Xiuzhang;Liu Junming
RMn2O5系列的多铁性尚不清楚，对其对高温(高温)极化组态的依赖也较少受到关注。此外，关于高T空间群对称性的问题到目前为止还没有达成共识。有鉴于此，人们可能会争辩说，RMn2O5在低T范围内的多铁性取决于远高于多铁有序化温度的极化顺序。在这项工作中，我们详细地研究了GdMn2O5中磁感应电极化的变化及其与高温电场极化方式的关系。结果表明，随着高温极化方式的改变，多铁性表现出不同的性质，这与可能的高温偏振态密切相关。这些新出现的现象可以定性地解释为两个低T偏振分量的共存，这是先前提出的一种情况。一种是与Mn3+-Mn4+-Mn3+交换限制有关的成分，似乎被高T偏振态紧紧地钳制着；另一种是与Gd3+-Mn4+-Gd3+交换限制有关的成分，没有钳制。这一发现可能为电控RMn2O5的多铁性提供一种不同的方案。
The multiferroicity in the RMn2O5 family remains unclear, and less attention has been paid to its dependence on high-temperature (high-T) polarized configuration. Moreover, no consensus on the high-T space group symmetry has been reached so far. In view of this consideration, one may argue that the multiferroicity of RMn2O5 in the low-T range depends on the poling sequence starting far above the multiferroic ordering temperature. In this work, we investigate in detail the variation of magnetically induced electric polarization in GdMn2O5 and its dependence on electric field poling routine in the high-T range. It is revealed that the multiferroicity does exhibit qualitatively different behaviors if the high-T poling routine changes, indicating the close correlation with the possible high-T polarized state. These emergent phenomena may be qualitatively explained by the co-existence of two low-T polarization components, a scenario that was proposed earlier. One is the component associated with the Mn3+–Mn4+–Mn3+ exchange striction that seems to be tightly clamped by the high-T polarized state, and the other is the component associated with the Gd3+–Mn4+–Gd3+ exchange striction that is free of the clamping. The present findings may offer a different scheme for the electric control of the multiferroicity in RMn2O5.