Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study
Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study
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DOI：
10.1063/1.3455808
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发表时间：
2010-06-01
影响因子：
0.8
通讯作者：
Gnatchenko, S. L.
中科院分区：
文献类型：
--
作者：
Gnezdilov, V. P.;Lamonova, K. V.;Gnatchenko, S. L.
亚晶格亚铁磁体Cu2OSeO_3具有立方对称性和线性磁电效应。没有光谱证据表明T-C=60K以下的结构晶格扭曲，这是由于磁电耦合所致。利用对称性论证，我们考虑了一种特殊类型的亚铁磁性基态，它不会产生自发电极化，从而解释了这一现象。有趣的是，拉曼散射显示了介质的电极化通过动态磁电效应的强烈增加，在T-C以下的散射强度显著增强。在磁有序状态下检测到纯磁起源的新谱线。其中一部分被归因于对交换磁子的散射。利用这一观察结果和进一步的对称性考虑，我们认为Cu2OSeO_3中存在着很强的Dzyaloshinskii-Moriya相互作用。(C)2010年美国物理研究所。[DOI：10.1063/1.3455808]
sublattices ferrimagnet Cu2OSeO3 with a cubic symmetry and a linear magnetoelectric effect. There is no spectroscopic evidence for structural lattice distortions below T-C=60 K, which are expected due to magnetoelectric coupling. Using symmetry arguments we explain this observation by considering a special type of ferrimagnetic ground state which does not generate a spontaneous electric polarization. Interestingly, Raman scattering shows a strong increase of electric polarization of media through a dynamic magnetoelectric effect as a remarkable enhancement of the scattering intensity below T-C. New lines of purely magnetic origin have been detected in the magnetically ordered state. A part of them are attributed as scattering on exchange magnons. Using this observation and further symmetry considerations we argue for strong Dzyaloshinskii-Moriya interaction existing in the Cu2OSeO3. (c) 2010 American Institute of Physics. [doi:10.1063/1.3455808]