Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs2 with spin-glass-like behavior

Long Chen; Yuhao Gu; Yulong Wang; Ying Zhou; Ke Liao; Yue Pan; Xianxin Wu; Ying Li; Zhichuan Wang; Yuzhe Ma; Zhongnan Guo; Jie Ma; Dong Su; Jiangping Hu; Gang Wang

doi:10.59717/j.xinn-mater.2023.100011

The Innovation Materials > 2023 Vol. 1 > No. 1 > 100011

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Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs₂ with spin-glass-like behavior

1.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
4.
Key Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
5.
Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
6.
These authors contributed equally

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Corresponding authors: jphu@iphy.ac.cn (J. H.); gangwang@iphy.ac.cn (G. W.)
Received Date: 06 March 2023

Accepted Date: 01 June 2023

Published Online: 13 June 2023

The Innovation Materials 1(1), https://doi.org/10.59717/j.xinn-mater.2023.100011 | Cite this article

GRAPHICAL ABSTRACT

GRAPHICAL ABSTRACT

PUBLIC SUMMARY

PUBLIC SUMMARY
1. Negative magnetoresistance (NMR) has unique performance in spintronics.
  
  CeCuAs₂ is classified as a strong topological insulator in its paramagnetic state.
  
  CeCuAs₂ exhibits large NMR beyond chiral anomaly, reaching -15% under 9 T at 2 K.
  
  A spin-glass-like state with T_f ~ 4.5 K hints possible spin-charge interaction.
  
  Tuning based on RE-Cu-As structural motif may provide new insights to explore NMR.

ABSTRACT

ABSTRACT

Large negative magnetoresistance (NMR), an important property for spintronics, requires experimental realization owing to the lack of suitable structural motifs. Herein, a remarkable NMR of up to -15% under 9 T at 2 K is demonstrated in a 112-type topological insulator candidate CeCuAs₂ single crystal containing an As square net. Due to the presence of Dirac points coming from both the As square net and Ce–Cu–As layer in the paramagnetic state of CeCuAs₂, the possibility of chiral anomaly is examined and eliminated by investigating magnetoresistance (MR) with different magnetic field configurations and angle-dependant MR, which show no specific restriction on the configurations under the applied magnetic fields. Upon investigation of the anisotropic magnetism, a spin-glass-like behavior with T_f ~ 4.5 K is observed in CeCuAs₂, indicating that the large NMR could be attributed to the spin-dependent scattering induced by the possible spin-glass state. Hall resistivity exhibits a multiband feature and hole-dominated transport properties, corresponding well with the calculated band structure. This study not only offers a new building block for large NMR but also serves as a guide for investigating the interplay among transport properties, topology, and magnetism, and it is expected to broaden the research on spintronics.

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Chen L., Gu Y., Wang Y., et al., (2023). Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs2 with spin-glass-like behavior. The Innovation Materials 1(1), 100011. https://doi.org/10.59717/j.xinn-mater.2023.100011

Chen L., Gu Y., Wang Y., et al., (2023). Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs₂ with spin-glass-like behavior. The Innovation Materials 1(1), 100011. https://doi.org/10.59717/j.xinn-mater.2023.100011

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Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs₂ with spin-glass-like behavior

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Large negative magnetoresistance beyond chiral anomaly in topological insulator candidate CeCuAs₂ with spin-glass-like behavior