Magnetoresistance of semimetals: The case of antimony
Magnetoresistance of semimetals: The case of antimony
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DOI：
10.1103/physrevmaterials.2.114201
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发表时间：
2018-11-07
影响因子：
3.4
通讯作者：
Behnia, Kamran
中科院分区：
文献类型：
--
作者：
Fauque, Benoit;Yang, Xiaojun;Behnia, Kamran
最近在许多半金属材料中发现了大的不饱和磁阻。它们中的许多在拓扑上具有非平凡的带散，例如Weyl节点或线。在此，我们发现在所有已知的半金属中，元素Sb显示出最大的高场磁阻。我们对角度相关的磁阻进行了详细的研究，并使用了一个调用各向异性迁移率张量的半经典框架来拟合数据。在研究的整个温度窗口内，为了在任意磁场强度和取向下获得完美的拟合，需要对迁移率张量各分量的磁场稍有偏离和随磁场的适度变化。我们的结果表明，大的轨道磁阻是低载流子浓度不可避免的结果，而在许多半金属中看到的亚二次磁阻可以归因于依赖于场的迁移率，当无序长度尺度超过费米波长时就会出现这种情况。
Large unsaturated magnetoresistance has been recently reported in numerous semimetals. Many of them have a topologically nontrivial band dispersion, such as Weyl nodes or lines. Here, we show that elemental antimony displays the largest high-field magnetoresistance among all known semimetals. We present a detailed study of the angle-dependent magnetoresistance and use a semiclassical framework invoking an anisotropic mobility tensor to fit the data. A slight deviation from perfect compensation and a modest variation with magnetic field of the components of the mobility tensor are required to attain perfect fits at arbitrary strength and orientation of magnetic field in the entire temperature window of study. Our results demonstrate that large orbital magnetoresistance is an unavoidable consequence of low carrier concentration and the subquadratic magnetoresistance seen in many semimetals can be attributed to field-dependent mobility, expected whenever the disorder length scale exceeds the Fermi wavelength.