C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb2

IF 3.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Chinese Physics Letters Pub Date : 2024-03-01 DOI:10.1088/0256-307x/41/3/037104
Bo Li, Xu-Tao Zeng, Qianhui Xu, Fan Yang, Junsen Xiang, Hengyang Zhong, Sihao Deng, Lunhua He, Juping Xu, Wen Yin, Xingye Lu, Huiying Liu, Xian-Lei Sheng, Wentao Jin
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Abstract

Determination of the magnetic structure and confirmation of the presence or absence of inversion ( P ) and time reversal ( T ) symmetry is imperative for correctly understanding the topological magnetic materials. Here high-quality single crystals of the layered manganese pnictide CaMnSb2 are synthesized using the self-flux method. De Haas–van Alphen oscillations indicate a nontrivial Berry phase of ∼ π and a notably small cyclotron effective mass, supporting the Dirac semimetal nature of CaMnSb2. Neutron diffraction measurements identify a C-type antiferromagnetic structure below T N = 303(1) K with the Mn moments aligned along the a axis, which is well supported by the density functional theory (DFT) calculations. The corresponding magnetic space group is Pnma′, preserving a P×T symmetry. Adopting the experimentally determined magnetic structure, band crossings near the Y point in momentum space and linear dispersions of the Sb 5p y, z bands are revealed by the DFT calculations. Furthermore, our study predicts the possible existence of an intrinsic second-order nonlinear Hall effect in CaMnSb2, offering a promising platform to study the impact of topological properties on nonlinear electrical transports in antiferromagnets.
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拓扑半金属 CaMnSb2 的 C 型反铁磁结构
要正确理解拓扑磁性材料,就必须确定磁性结构并确认是否存在反转(P)和时间反转(T)对称性。在此,我们采用自流式方法合成了层状锰锑化合物 CaMnSb2 的高质量单晶体。德哈斯-范阿尔芬振荡表明,CaMnSb2 的贝里相为 ∼ π,而且回旋有效质量非常小,这支持了 CaMnSb2 的狄拉克半金属性质。中子衍射测量确定了低于 TN = 303(1) K 的 C 型反铁磁结构,锰矩沿 a 轴排列,密度泛函理论(DFT)计算也很好地支持了这一点。相应的磁性空间群为 Pn′m′a′,保持 P×T 对称性。采用实验确定的磁结构,DFT 计算揭示了动量空间 Y 点附近的带交叉和 Sb 5py、z 带的线性色散。此外,我们的研究还预测了 CaMnSb2 中可能存在的内在二阶非线性霍尔效应,为研究拓扑特性对反铁磁体中非线性电传输的影响提供了一个前景广阔的平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Chinese Physics Letters
Chinese Physics Letters 物理-物理:综合
CiteScore
5.90
自引率
8.60%
发文量
13238
审稿时长
4 months
期刊介绍: Chinese Physics Letters provides rapid publication of short reports and important research in all fields of physics and is published by the Chinese Physical Society and hosted online by IOP Publishing.
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