| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb$_2$ |
| Bo Li1, Xu-Tao Zeng1, Qianhui Xu1, Fan Yang1, Junsen Xiang2, Hengyang Zhong3, Sihao Deng4, Lunhua He4,2,5, Juping Xu4, Wen Yin4, Xingye Lu3, Huiying Liu1*, Xian-Lei Sheng1*, and Wentao Jin1* |
1School of Physics, Beihang University, Beijing 100191, China
2Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
4Spallation Neutron Source Science Center, Dongguan 523803, China
5Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Bo Li, Xu-Tao Zeng, Qianhui Xu et al 2024 Chin. Phys. Lett. 41 037104 |
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Abstract 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 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 $5{\rm p}_{y,\,z}$ 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.
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Received: 23 February 2024
Published: 25 March 2024
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| PACS: |
03.67.Lx
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(Quantum computation architectures and implementations)
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03.67.-a
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(Quantum information)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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