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Extremely Large Anomalous Hall Conductivity and Unusual Axial Diamagnetism in a Quasi-1D Dirac Material La3MgBi5
Advanced Materials ( IF 27.4 ) Pub Date : 2024-07-25 , DOI: 10.1002/adma.202400166 Zhe-Kai Yi 1 , Zhen-Feng Ouyang 2 , Peng-Jie Guo 2 , Hui Liang 1 , Yi-Ran Li 1 , Ping Su 1 , Na Li 1 , Ying Zhou 1 , Dan-Dan Wu 1 , Yan Sun 1 , Xiao-Yu Yue 3 , Qiu-Ju Li 4 , Shou-Guo Wang 1 , Xue-Feng Sun 1, 5 , Yi-Yan Wang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2024-07-25 , DOI: 10.1002/adma.202400166 Zhe-Kai Yi 1 , Zhen-Feng Ouyang 2 , Peng-Jie Guo 2 , Hui Liang 1 , Yi-Ran Li 1 , Ping Su 1 , Na Li 1 , Ying Zhou 1 , Dan-Dan Wu 1 , Yan Sun 1 , Xiao-Yu Yue 3 , Qiu-Ju Li 4 , Shou-Guo Wang 1 , Xue-Feng Sun 1, 5 , Yi-Yan Wang 1
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Anomalous Hall effect (AHE), one of the most important electronic transport phenomena, generally appears in ferromagnetic materials but is rare in materials without magnetic elements. Here, a study of La3MgBi5 is presented, whose band structure carries multitype Dirac fermions. Although magnetic elements are absent in La3MgBi5, the signals of AHE can be observed. In particular, the anomalous Hall conductivity is extremely large, reaching 42,356 Ω−1 cm−1 with an anomalous Hall angle of 8.8%, the largest one that has been observed in the current AHE systems. The AHE is suggested to originate from the combination of skew scattering and Berry curvature. Another unique property discovered in La3MgBi5 is the axial diamagnetism. The diamagnetism is significantly enhanced and dominates the magnetization in the axial directions, which is the result of the restricted motion of the Dirac fermion at the Fermi level. These findings not only establish La3MgBi5 as a suitable platform to study AHE and quantum transport but also indicate the great potential of 315-type Bi-based materials for exploring novel physical properties.
中文翻译：
准一维狄拉克材料 La3MgBi5 中极大的反常霍尔电导率和异常轴向抗磁性
反常霍尔效应（AHE）是最重要的电子传输现象之一，通常出现在铁磁材料中，但在不含磁性元素的材料中很少见。这里，提出了对 La 3 MgBi 5的研究，其能带结构携带多种狄拉克费米子。虽然La 3 MgBi 5中不存在磁性元素，但可以观察到AHE信号。特别是，反常霍尔电导率非常大，达到42,356 Ω -1 cm -1 ，反常霍尔角为8.8%，是当前AHE系统中观察到的最大反常霍尔角。 AHE 被认为源自斜散射和贝里曲率的组合。 La 3 MgBi 5中发现的另一个独特性质是轴向抗磁性。抗磁性显着增强并主导轴向磁化强度，这是狄拉克费米子在费米能级受限运动的结果。这些发现不仅使La 3 MgBi 5成为研究AHE和量子输运的合适平台，而且表明315型Bi基材料在探索新物理性质方面具有巨大潜力。
更新日期：2024-07-25
中文翻译：
准一维狄拉克材料 La3MgBi5 中极大的反常霍尔电导率和异常轴向抗磁性
反常霍尔效应（AHE）是最重要的电子传输现象之一，通常出现在铁磁材料中，但在不含磁性元素的材料中很少见。这里，提出了对 La 3 MgBi 5的研究，其能带结构携带多种狄拉克费米子。虽然La 3 MgBi 5中不存在磁性元素，但可以观察到AHE信号。特别是，反常霍尔电导率非常大，达到42,356 Ω -1 cm -1 ，反常霍尔角为8.8%，是当前AHE系统中观察到的最大反常霍尔角。 AHE 被认为源自斜散射和贝里曲率的组合。 La 3 MgBi 5中发现的另一个独特性质是轴向抗磁性。抗磁性显着增强并主导轴向磁化强度，这是狄拉克费米子在费米能级受限运动的结果。这些发现不仅使La 3 MgBi 5成为研究AHE和量子输运的合适平台，而且表明315型Bi基材料在探索新物理性质方面具有巨大潜力。
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