Electromagnons in the spin collinear state of a triangular lattice antiferromagnet.
Electromagnons in the spin collinear state of a triangular lattice antiferromagnet.
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DOI：
10.1103/physrevlett.105.097207
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发表时间：
2010-08
影响因子：
8.6
通讯作者：
S. Seki;N. Kida;S. Kumakura;R. Shimano;Y. Tokura
中科院分区：
文献类型：
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作者：
S. Seki;N. Kida;S. Kumakura;R. Shimano;Y. Tokura
用太赫兹时域谱直接探测了三角形晶格反铁磁体CuFe(1-x)Ga(X)O2(x=0.00，0.01，0.035)的低能(1-5 meV)电动力学。我们在顺电↑↑↓↓共线磁相中发现了2.3 meV的电磁振子(电场活动磁振子)激发，而这种电磁振子在铁电日磁相中消失。与非共线磁性的反关联排除了交换-伸缩机制作为动态磁电耦合的起源，从而证明了在本化合物中观察到了自旋-轨道耦合介导的电磁振子。
Terahertz time-domain spectroscopy was performed to directly probe the low-energy (1-5 meV) electrodynamics of triangular lattice antiferromagnets CuFe(1-x)Ga(x)O2 (x=0.00, 0.01, and 0.035). We discovered an electromagnon (electric-field-active magnon) excitation at 2.3 meV in the paraelectric ↑↑↓↓ collinear magnetic phase, while this electromagnon vanishes in the ferroelectric helimagnetic phase. Anticorrelation with noncollinear magnetism excludes the exchange-striction mechanism as the origin of dynamical magnetoelectric coupling, and hence evidences the observation of a spin-orbit coupling mediated electromagnon in the present compound.