论文标题
原子障碍和浆果相驱动异常霍尔在二氧化碳啤酒中的异常效应
Atomic disorder and Berry phase driven anomalous Hall effect in Co2FeAl Heusler compound
论文作者
论文摘要
基于CO2的Heusler化合物是Spintronics应用的有前途的材料，因为它们的高温温度，较大的自旋极化，较大的磁化密度和外来的传输特性。在当前的手稿中，我们使用合并的实验和理论研究报告了多晶二氧化碳Heusler化合物中的异常霍尔效应（AHE）。高分辨率同步加速器X射线衍射数据的Rietveld分析表明，Fe和Al原子之间的抗酸盐疾病很大程度（约50％）。对异常传输数据的分析提供了在2 K时的实验异常电导率（AHC），约为227 s/cm，固有贡献为155 s/cm，与温度几乎恒定变化。异常霍尔电阻率的详细缩放分析表明，二氧化碳中的AHE受浆果相驱动的内在机制的控制。我们的理论计算表明，二氧化碳化合物中存在的疾病增强了浆果曲率诱导的内在AHC。
Co2-based Heusler compounds are the promising materials for the spintronics application due to their high Curie temperature, large spin-polarization, large magnetization density, and exotic transport properties. In the present manuscript, we report the anomalous Hall effect (AHE) in a polycrystalline Co2FeAl Heusler compound using combined experimental and theoretical studies. The Rietveld analysis of high-resolution synchrotron x-ray diffraction data reveals a large degree (~50 %) of antisite disorder between Fe and Al atoms. The analysis of anomalous transport data provides the experimental anomalous Hall conductivity (AHC) about 227 S/cm at 2 K with an intrinsic contribution of 155 S/cm, which has nearly constant variation with temperature. The detailed scaling analysis of anomalous Hall resistivity suggests that the AHE in Co2FeAl is governed by the Berry phase driven intrinsic mechanism. Our theoretical calculations reveal that the disorder present in Co2FeAl compound enhances the Berry curvature induced intrinsic AHC.
