Non-vanishing Berry curvature driven large anomalous Hall effect in non-collinear antiferromagnet Mn3Ge
Non-vanishing Berry curvature driven large anomalous Hall effect in non-collinear antiferromagnet Mn3Ge
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非共线反铁磁体 Mn3Ge 中非零贝里曲率驱动的大反常霍尔效应
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Felser
中科院分区：
文献类型：
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作者：
A. Nayak;J. Fischer;Yan Sun;Binghai Yan;J. Karel;A. Komarek;C. Shekhar;Nitesh Kumar;W. Schnelle;J. Kuebler;S. Parkin;C. Felser
已经确定的是，反常霍尔效应与铁磁体的磁化强度大致成比例，因此，对于反铁磁体，由于其净磁矩为零，反常霍尔效应应该消失。然而，最近的理论工作预测，一个大的异常霍尔效应可以在一些非共线反铁磁体中实现，从一个非零的贝里相位曲率。在这里，我们表明，非共线的反铁磁体Mn 3Ge与实际零净磁矩表现出大的反常霍尔效应可比的铁磁金属，反常电导率的幅度为500每欧姆每厘米在2 K和约50每欧姆每厘米在室温下。Mn3Ge中的反三角自旋排列确保了非零的Berry曲率，从而导致了所观察到的效应。
It has been established that the anomalous Hall effect roughly scales with the magnetization of a ferromagnet.Therefore, it should disappear for an antiferromagnet due to its zero net magnetic moment. However, recent theoretical works have predicted that a large anomalous Hall effect can be accomplished in some of the non-collinear antiferromagnets resulting from a non-vanishing Berry-phase curvature. Here we show that the non-collinear antiferromagnet Mn3Ge with practically zero net magnetic moment exhibits a large anomalous Hall effect comparable to that of ferromagnetic metals, the magnitude of the anomalous conductivity is 500 per Ohm per cm at 2 K and about 50 per Ohm per cm at at room temperature. The inverse triangular spin-alignment in Mn3Ge ensures a non-vanishing Berry curvature, leading to the observed effect.