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arXiv 0910.4557cond-mat.str-elcond-mat.mtrl-sci
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SrRuO $_3$中红外反常霍尔效应:向本征行为交叉的证据

Infrared anomalous Hall effect in SrRuO$_3$: Evidence for crossover to intrinsic behavior

M. -H. Kim, G. Acbas, M. -H. Yang, M. Eginligil, P. Khalifah, I. Ohkubo, H. Christen, D. Mandrus, Z. Fang, J. Cerne

摘要:

在许多巡回铁磁体的霍尔效应的起源仍然没有解决,从样品磁化,可以表现出外在或内在的行为的异常贡献。我们报告的第一个中红外(MIR)测量复杂的霍尔($θ_H$),法拉第($θ_F$),和克尔($θ_K$)角,以及霍尔电导率($σ_{xy}$)在SrRuO $_3$膜在115-1400 meV的能量范围。探讨了磁场、温度和频率对霍尔效应的影响。MIR磁光响应显示出非常强的频率依赖性,包括符号变化。低于200毫电子伏,MIR $θ_H (T)$改变120和150 K之间的符号,在直流霍尔测量观察到。高于200毫电子伏,$θ_H$的温度依赖性是类似的直流磁化和测量是在良好的协议与预测从带计算的固有异常霍尔效应(AHE)。测得的霍尔效应的温度和频率依赖性表明,而高于200毫电子伏的行为是一致的内在AHE,外在AHE在较低的能量响应中起着重要的作用。

英文摘要:

The origin of the Hall effect in many itinerant ferromagnets is still not resolved, with an anomalous contribution from the sample magnetization that can exhibit extrinsic or intrinsic behavior. We report the first mid-infared (MIR) measurements of the complex Hall ($θ_H$), Faraday ($θ_F$), and Kerr ($θ_K$) angles, as well as the Hall conductivity ($σ_{xy}$) in a SrRuO$_3$ film in the 115-1400 meV energy range. The magnetic field, temperature, and frequency dependence of the Hall effect is explored. The MIR magneto-optical response shows very strong frequency dependence, including sign changes. Below 200 meV, the MIR $θ_H (T)$ changes sign between 120 and 150 K, as is observed in dc Hall measurements. Above 200 meV, the temperature dependence of $θ_H$ is similar to that of the dc magnetization and the measurements are in good agreement with predictions from a band calculation for the intrinsic anomalous Hall effect (AHE). The temperature and frequency dependence of the measured Hall effect suggests that whereas the behavior above 200 meV is consistent with an intrinsic AHE, the extrinsic AHE plays an important role in the lower energy response.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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