Understanding the multiferroicity in TmMn(2)O(5) by a magnetically induced ferrielectric model.
Understanding the multiferroicity in TmMn(2)O(5) by a magnetically induced ferrielectric model.
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通过磁感应铁电模型了解 TmMn2O5 的多铁性
DOI：
10.1038/srep34767
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发表时间：
2016-10-07
影响因子：
4.6
通讯作者：
Liu JM
中科院分区：
文献类型：
--
作者：
Yang L;Li X;Liu MF;Li PL;Yan ZB;Zeng M;Qin MH;Gao XS;Liu JM
利用高精度热释电电流技术等一系列表征手段，研究了多铁性TmMn_2O_5的磁感应极化行为随温度和磁场的变化.在这里，多晶而不是单晶样品用于避免在单晶中的强电自极化效应，并进行各种平行实验，排除热激发电流的贡献。在不同的测量路径中，温度依赖的电极化触发器是主要特征。磁电流测量表明，低温磁相区的电极化与高温磁相区的电极化有不同的起源。结果表明，该电极极化确实存在多个分量，它们沿沿着不同的取向排列，包括Mn ~（3+）-Mn ~（4+）-Mn ~（3+）交换致伸缩极化PMM、Tm ~（3+）-Mn ~（4+）-Tm ~（3+）交换致伸缩极化PTM以及可能与Tm ~（3+）相称相有关的低温极化PLT。观察到的电极化翻转可以合理地解释由铁电体模型提出的DyMn 2 O 5，其中PMM和PTM是两个反平行的组件都沿着b轴和PLT可以沿沿着a轴排列。最后，对铁电极化的温度依赖性进行了讨论。
The magnetically induced electric polarization behaviors in multiferroic TmMn2O5 in response to varying temperature and magnetic field are carefully investigated by means of a series of characterizations including the high precision pyroelectric current technique. Here polycrystalline rather than single crystal samples are used for avoiding the strong electrically self-polarized effect in single crystals, and various parallel experiments on excluding the thermally excited current contributions are performed. The temperature-dependent electric polarization flop as a major character is identified for different measuring paths. The magneto-current measurements indicate that the electric polarization in the low temperature magnetic phase region has different origin from that in the high temperature magnetic phase. It is suggested that the electric polarization does have multiple components which align along different orientations, including the Mn3+-Mn4+-Mn3+ exchange striction induced polarization PMM, the Tm3+-Mn4+-Tm3+ exchange striction induced polarization PTM, and the low temperature polarization PLT probably associated with the Tm3+ commensurate phase. The observed electric polarization flop can be reasonably explained by the ferrielectric model proposed earlier for DyMn2O5, where PMM and PTM are the two antiparallel components both along the b-axis and PLT may align along the a-axis. Finally, several issues on the unusual temperature dependence of ferroelectric polarizations are discussed.
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影响因子：
8.6
作者：
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通讯作者：
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作者：
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作者：
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作者：
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