Third-order longitudinal transport in van der Waals antiferromagnet Fe5AsTe2

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Abstract
We systematically investigate the prominent third-order longitudinal nonlinear transport in centrosymmetric van der Waals antiferromagnet Fe5AsTe2. It is shown that the third-order longitudinal response can be decomposed into a magnetism-driven term and a field-induced term. Below the Néel temperature, the magnetism contribution dominates over the field contribution by an order of magnitude and evolves markedly with the magnetic phase transitions. It manifests as a plateau in the zero-field antiferromagnetic state and saturates in the high-field ferromagnetic phase. Scaling law analysis further reveals that the third-order longitudinal conductivity follows a characteristic polynomial in the linear conductivity expected for the third-order skew scattering. Our work demonstrates that the third-order longitudinal nonlinear response serves as an effective electrical probe of magnetic order evolution in centrosymmetric antiferromagnets, laying a foundation for future nonlinear antiferromagnetic spintronic devices.
Funding Information
  • National Key Research and Development Program of China (2022YFA1403700)
  • National Natural Science Foundation of China (12374041)
  • National Natural Science Foundation of China (12350402)
  • Guangdong Provincial Ley Laboratory of Advanced Thermoelectric Materials and Device Physics (2024B1212010001)
  • Guangdong Basic and Applied Basic Research Foundation (2023B0303000011)
  • Science, Technology, and Innovation Commission of Shenzhen Municipality (ZDSYS20190902092905285)

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