Coupling between the spatially separated magnetism and the topological band revealed by magnetotransport measurements on EuMn1−xZnxSb2 (0≤x≤1)

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National Natural Science Foundation of China: 12004056
National Natural Science Foundation of China: 11904040
National Natural Science Foundation of China: 11974065
National Natural Science Foundation of China: 52071041
National Natural Science Foundation of China: 12104072
National Natural Science Foundation of China: 12147102
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Physical Review B. American Physical Society (APS). 2023, 108(16), 165115. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/physrevb.108.165115
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We study the coupling between topological bands and two distinct magnetic sublattices in EuMn1−xZnxSb2 (0≤x≤1) using a combination of magnetotransport measurements and density functional theory (DFT) calculations. Hall measurements reveal a low carrier concentration with high mobility across all samples, allowing the observation of quantum oscillation in the range of 0≤x≤0.8 at a relatively low magnetic field. Upon analyzing the quantum oscillation data, the fast Fourier transform spectra for 0≤x≤0.8 exhibit a relatively weak Zn doping dependency but a significant temperature dependency. This weak Zn doping dependency suggests that the magnetotransport properties of EuMn1−xZnxSb2 are dominated by quasi-two-dimensional small Fermi pockets originating from the Sb zigzag chains, which remain largely unaffected by varying Mn content. The significant temperature-dependent phase of the oscillation indicates that the topological state is tunable by the magnetism of Eu. Our observations suggest that the topological bands arising from Sb zigzag chains are sensitive to adjacent Eu magnetism but are relatively insensitive to more distant Mn atoms. Our experimental results are in good agreement with the DFT calculations, which show that Zn doping introduces only minor electron-type carriers at the Fermi level without substantially altering the Dirac bands. Our study will be helpful for understanding the mechanism of coupling between spatially separated magnetism and topological bands, offering insights that could be valuable for the design of materials with magnetism-tunable topological electronic structures.

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ISO 690XIA, Yuanying, Lin WANG, Yuanhao ZHU, Liyu ZHANG, Yan LIU, Xueliang WU, Long ZHANG, Huixia FU, Xiaoyuan ZHOU, Aifeng WANG, 2023. Coupling between the spatially separated magnetism and the topological band revealed by magnetotransport measurements on EuMn1−xZnxSb2 (0≤x≤1). In: Physical Review B. American Physical Society (APS). 2023, 108(16), 165115. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/physrevb.108.165115
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@article{Xia2023Coupl-68243,
  year={2023},
  doi={10.1103/physrevb.108.165115},
  title={Coupling between the spatially separated magnetism and the topological band revealed by magnetotransport measurements on EuMn<sub>1−x</sub>Zn<sub>x</sub>Sb<sub>2</sub> (0≤x≤1)},
  number={16},
  volume={108},
  issn={2469-9950},
  journal={Physical Review B},
  author={Xia, Yuanying and Wang, Lin and Zhu, Yuanhao and Zhang, Liyu and Liu, Yan and Wu, Xueliang and Zhang, Long and Fu, Huixia and Zhou, Xiaoyuan and Wang, Aifeng},
  note={Article Number: 165115}
}
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