Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Phys Rev Lett. 2010 Aug 27;105(9):097207. doi: 10.1103/PhysRevLett.105.097207.
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.
太赫兹时域光谱被用来直接探测三角晶格反铁磁体 CuFe(1-x)Ga(x)O2（x=0.00、0.01 和 0.035）的低能（1-5 meV）电磁动力学。我们在顺磁↑↑↓↓的 collinear 磁相发现了一个 2.3 meV 的电磁激元（电场激活的磁振子）激发，而在铁电螺旋磁相中这个电磁激元消失了。与非 collinear 磁的反相关性排除了交换-限制机制作为动态磁电耦合的起源，因此证明了在目前的化合物中观察到了一种由自旋轨道耦合介导的电磁激元。
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