Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV3Sb5
Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV3Sb5
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DOI：
10.1126/sciadv.abb6003
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发表时间：
2020-07
期刊：
影响因子：
13.6
通讯作者：
Shuo Yang;Yaoji Wang;B. Ortiz;Defa Liu;J. Gayles;E. Derunova;R. González-Hernández;L. Šmejkal-L.-Šmejka
中科院分区：
文献类型：
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作者：
Shuo Yang;Yaoji Wang;B. Ortiz;Defa Liu;J. Gayles;E. Derunova;R. González-Hernández;L. Šmejkal-L.-Šmejka
当狄拉克准粒子遇到阻挫磁性时，反常的霍尔效应会飙升。反常霍尔效应是物理学中最基本的现象之一。在高导电体系中，铁磁金属一直是过去研究的焦点。在这里，我们报告了一个巨大的外来AHE在KV 3Sb 5，可剥离的，高导电半金属狄拉克准粒子和钒Kagome网。即使没有长程磁序的报告，异常霍尔电导率也达到15，507 <$−1 cm−1，异常霍尔比为1.8%，比铁大一个数量级。与理论预期相反，KV 3Sb 5显示出增强的斜散射，其与纵向电导率成二次而非线性比例，这可能是由高导电性狄拉克准粒子与受抑磁子晶格的组合引起的。这使得在金属中达到90°的反常霍尔角成为可能。这一观察提出了关于AHE的基本问题，并为AHE和自旋霍尔效应探索开辟了新的领域，特别是在金属阻挫磁体中。
The anomalous Hall effect soars when Dirac quasiparticles meet frustrated magnetism. The anomalous Hall effect (AHE) is one of the most fundamental phenomena in physics. In the highly conductive regime, ferromagnetic metals have been the focus of past research. Here, we report a giant extrinsic AHE in KV3Sb5, an exfoliable, highly conductive semimetal with Dirac quasiparticles and a vanadium Kagome net. Even without report of long range magnetic order, the anomalous Hall conductivity reaches 15,507 Ω−1 cm−1 with an anomalous Hall ratio of ≈ 1.8%; an order of magnitude larger than Fe. Defying theoretical expectations, KV3Sb5 shows enhanced skew scattering that scales quadratically, not linearly, with the longitudinal conductivity, possibly arising from the combination of highly conductive Dirac quasiparticles with a frustrated magnetic sublattice. This allows the possibility of reaching an anomalous Hall angle of 90° in metals. This observation raises fundamental questions about AHEs and opens new frontiers for AHE and spin Hall effect exploration, particularly in metallic frustrated magnets.