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首页> 外文期刊>Physical review >Large anomalous Nernst and spin Nernst effects in the noncollinear antiferromagnets Mn_3X (X = Sn,Ge,Ga)
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Large anomalous Nernst and spin Nernst effects in the noncollinear antiferromagnets Mn_3X (X = Sn,Ge,Ga)

机译：非共线反铁磁体Mn_3X（X = Sn，Ge，Ga）中的大异常能斯特和自旋能斯特效应

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摘要

Noncollinear antiferromagnets have recently been attracting considerable interest partly due to recent surprising discoveries of the anomalous Hall effect (AHE) in them and partly because they have promising applications in antiferromagnetic spintronics. Here we study the anomalous Nernst effect (ANE), a phenomenon having the same origin as the AHE, and also the spin Nernst effect (SNE) as well as AHE and the spin Hall effect (SHE) in noncollinear antiferromagnetic Mn_3X (X = Sn, Ge, Ga) within the Berry phase formalism based on ab initio relativistic band structure calculations. For comparison, we also calculate the anomalous Nernst conductivity (ANC) and anomalous Hall conductivity (AHC) of ferromagnetic iron as well as the spin Nernst conductivity (SNC) of platinum metal. Remarkably, the calculated ANC at room temperature (300 K) for all three alloys is huge, being 10-40 times larger than that of iron. Moreover, the calculated SNC for Mn_3Sn and Mn_3Ga is also larger, being about five times larger than that of platinum. This suggests that these antiferromagnets would be useful materials for thermoelectronic devices and spin caloritronic devices. The calculated ANC of Mn_3Sn and iron are in reasonably good agreement with the very recent experiments. The calculated SNC of platinum also agrees with the very recent experiments in both sign and magnitude. The calculated thermoelectric and thermomagnetic properties are analyzed in terms of the band structures as well as the energy-dependent AHC, ANC, SNC, and spin Hall conductivity via the Mott relations.
机译：非共线反铁磁体最近引起了相当大的兴趣，部分原因是由于它们中异常霍尔效应（AHE）的最新令人惊讶的发现，部分原因是它们在反铁磁自旋电子学中具有广阔的应用前景。在这里我们研究异常能斯特效应（ANE），与AHE起源相同的现象，以及非共线反铁磁Mn_3X（X = Sn （Ge，Ga）。为了进行比较，我们还计算了铁磁性铁的能斯特电导率（ANC）和异常霍尔电导率（AHC）以及铂金属的自旋能斯特电导率（SNC）。值得注意的是，所有三种合金在室温（300 K）下计算出的ANC都很大，比铁大10-40倍。而且，针对Mn_3Sn和Mn_3Ga的计算出的SNC也较大，约为铂的五倍。这表明这些反铁磁体将是用于热电子器件和自旋热电子器件的有用材料。 Mn_3Sn和铁的ANC计算值与最近的实验相当吻合。铂的SNC计算值在符号和强度上也与最近的实验一致。根据能带结构以及依赖于能量的AHC，ANC，SNC和自旋霍尔电导率，通过Mott关系对计算的热电和热磁特性进行了分析。

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    《Physical review》 |2017年第22期|224415.1-224415.9|共9页
  • 作者

    Guang-Yu Guo; Tzu-Cheng Wang;

  • 作者单位

    Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan,Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan;

    Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan;

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