C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917652087177216 |
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| author | 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 |
| author_facet | 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 |
| contents | 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 $\sim$ $π$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01600 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$ 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 Strongly Correlated Electrons Materials Science 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 $\sim$ $π$ 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. |
| title | C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2404.01600 |