The interplay between topology and magnetism has recently sparked the frontier studies of magnetic topological materials that exhibit intriguing anomalous Hall and Nernst effects owning to the large intrinsic Berry curvature (BC). To better understand the anomalous quantum transport properties of these materials and their implications for future applications such as electronic and thermoelectric devices, it is crucial to discover more novel material platforms for performing anomalous transverse transport studies. Here, it is experimentally demonstrated that low-cost Fe-based Heusler compounds exhibit large anomalous Hall and Nernst effects. An anomalous Hall conductivity of 250–750 S cm⁻¹ and Nernst thermopower of above 2 µV K⁻¹ are observed near room temperature. The positive effect of anti-site disorder on the anomalous Hall transport is revealed. Considering the very high Curie temperature (nearly 1000 K), larger Nernst thermopowers at high temperatures are expected owing to the existing magnetic order and the intrinsic BC. This work provides a background for developing low-cost Fe-based Heusler compounds as a new material platform for anomalous transport studies and applications, in particular, near and above room temperature.

中文翻译：

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高居里温度铁基霍斯勒化合物中的大反常霍尔效应和能斯特效应

拓扑和磁性之间的相互作用最近引发了磁性拓扑材料的前沿研究，这些材料由于大的固有贝里曲率（BC）而表现出有趣的反常霍尔效应和能斯特效应。为了更好地了解这些材料的反常量子输运特性及其对电子和热电设备等未来应用的影响，发现更多新颖的材料平台来进行反常横向输运研究至关重要。在这里，实验证明低成本铁基霍斯勒化合物表现出巨大的反常霍尔效应和能斯特效应。在室温附近观察到异常霍尔电导率为 250–750 S cm ^-1，能斯特热电势超过 2 µV K ^{-1 。}揭示了反位点紊乱对异常霍尔传输的积极影响。考虑到非常高的居里温度（接近 1000 K），由于现有的磁序和固有的 BC，预计在高温下会出现更大的能斯特热电势。这项工作为开发低成本铁基霍斯勒化合物作为反常输运研究和应用的新材料平台提供了背景，特别是在接近和高于室温的温度下。