Optical Probe for Anomalous Hall Resonance in Ferromagnets with Spin Chirality
Optical Probe for Anomalous Hall Resonance in Ferromagnets with Spin Chirality
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DOI：
10.1103/physrevlett.103.267206
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发表时间：
2009-12-31
影响因子：
8.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Iguchi, S.;Kumakura, S.;Tokura, Y.
我们研究了能带填充控制的 Nd2Mo2O7 铁磁晶体的红外光学霍尔电导率 sigma(xy)(omega)，揭示了其反常霍尔效应 (AHE) 的动力学特性。在中红外区域（通常在 0.1 eV）的霍尔电导率谱中观察到共振结构及其系统填充依赖性，而在对角线（纵向或普通）电导率谱中没有发现类似的效应。 sigma(xy)(omega) 的这一性质为理解 AHE 的微观机制（包括其直流极限）提供了至关重要的信息。具体来说，类磁单极子带反交叉点处的带间跃迁（由自旋手性分裂）是 AHE 中的主要来源。
We have investigated the infrared optical Hall conductivity, sigma(xy)(omega) for band-filling-controlled ferromagnetic crystals of Nd2Mo2O7, revealing the dynamical properties of their anomalous Hall effect (AHE). A resonant structure and its systematic filling dependence were observed in the Hall conductivity spectra in the midinfrared region (typically at 0.1 eV), while similar effects were not discerned in the diagonal (longitudinal or ordinary) conductivity spectra. This property of sigma(xy)(omega) provides crucial and essential information to understand the microscopic mechanism of AHE including its dc limit. Specifically, the interband transition at the magnetic-monopole-like band-anticrossing point, which is split by spin chirality, is the dominant source in AHE.