首页|C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb2

C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb2

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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 TN=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 P × T symmetry.Adopting the experimentally determined magnetic structure,band crossings near the Y point in momentum space and linear dispersions of the Sb 5py,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.

李博、曾旭涛、徐千惠、杨帆、项俊森、钟恒扬、邓司浩、何伦华、徐菊萍、殷雯、鲁兴业、刘慧颖、胜献雷、金文涛

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School of Physics,Beihang University,Beijing 100191,China

Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Center for Advanced Quantum Studies and Department of Physics,Beijing Normal University,Beijing 100875,China

Spallation Neutron Source Science Center,Dongguan 523803,China

Songshan Lake Materials Laboratory,Dongguan 523808,China

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国家自然科学基金国家自然科学基金国家自然科学基金Large Scientific Facility Open Subject of Songshan Lake(Dongguan,Guangdong)中央高校基本科研业务费专项

120740231230405312174018

2024

10.1088/0256-307X/41/3/037104

中国物理快报(英文版)
中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI
影响因子：0.515
ISSN：0256-307X
年,卷(期)：2024.41(3)
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