تقرير
C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$
| العنوان: | C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$ |
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| المؤلفون: | Li, Bo, Zeng, Xu-Tao, Xu, Qianhui, Yang, Fan, Xiang, Junsen, Zhong, Hengyang, Deng, Sihao, He, Lunhua, Xu, Juping, Yin, Wen, Lu, Xingye, Liu, Huiying, Sheng, Xian-Lei, Jin, Wentao |
| المصدر: | Chinese Physics Letters 41, 037104 (2024) |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science |
| الوصف: | Determination of the magnetic structure and confirmation of the presence or absence of inversion ($\mathcal{P}$) and time reversal ($\mathcal{T}$) symmetry is imperative for correctly understanding the topological magnetic materials. Here high-quality single crystals of the layered manganese pnictide CaMnSb$_2$ are synthesized using the self-flux method. De Haas-van Alphen oscillations indicate a nontrivial Berry phase of $\sim$ $\pi$ and a notably small cyclotron effective mass, supporting the Dirac semimetal nature of CaMnSb$_2$. Neutron diffraction measurements identify a C-type antiferromagnetic (AFM) structure below $T\rm_{N}$ = 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 $Pn'm'a'$, preserving a $\mathcal{P}\times\mathcal{T}$ 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 CaMnSb$_2$, offering a promising platform to study the impact of topological properties on nonlinear electrical transports in antiferromagnets. Comment: 7 Pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0256-307X/41/3/037104 |
| URL الوصول: | http://arxiv.org/abs/2404.01600 |
| رقم الأكسشن: | edsarx.2404.01600 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0256-307X/41/3/037104 |
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