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  • Letter
  • Open Access

Disorder-mediated linear and nonlinear magnetotransport in the charge-density-wave material Ta2NiSe7

Xiaodong Sun1,2, Jiabin Qiao1,2,*, Yuanzhe Li1,2, Wanli He1,2, Jiali Chen1,2, Jinjin Liu1,2, Yuxiang Chen1,2, Yuchen Ma1,2, Meiling Jin1,2 et al.

Jianlin Luo3,4,5, Jie Chen1,2,†, Wei Wu3,‡, Zhiwei Wang1,2,§, Wei Jiang1,2,∥, Xiang Li1,2,¶, and Yugui Yao1,2

  • *Contact author: jiabinqiao@bit.edu.cn
  • †Contact author: jiechen.phy@bit.edu.cn
  • ‡Contact author: welyman@iphy.ac.cn
  • §Contact author: zhiweiwang@bit.edu.cn
  • ∥Contact author: wjiang@bit.edu.cn
  • Contact author: xiangli@bit.edu.cn
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Phys. Rev. Research 7, L042056 – Published 8 December, 2025

DOI: https://doi.org/10.1103/1zzj-lcf1

Abstract

We report disorder-mediated first-order linear and higher-order nonlinear (magneto-)transport of Ta2NiSe7 (TNS) in the charge-density-wave (CDW) regime. CDW transition temperature (TCDW) and carrier density are proportional and inversely proportional to residual resistance ratio of samples, respectively. Such relation helps to understand the unique CDW order therein. High-TCDW TNS exhibits negative first-harmonic magnetoresistance (MR1ω) under a magnetic field (B) parallel to the direction of alternating current (Iω), which may arise from the anomalous velocity induced by the Berry curvature of three-dimensional topological bands near the Fermi level. As TCDW drops, a positive-to-negative MR1ω transition is observed with decreasing perpendicular B, which is likely due to the contribution of Zeeman effect on current pathways in the disordered system. Moreover, interestingly, the second-harmonic nonlinear signals are suppressed, while the third-harmonic signals are significant and sensitive to both B and TCDW. Such observations, together with scaling analysis, suggest the quantum geometry quadrupole at play and the modulation of disorder on third-order nonlinearity. Our results pave an avenue for tailoring distinct-order magnetoresistive phases in disordered topological materials.

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Phys. Rev. Research 7, L042056– Published 8 December, 2025
  • Received 17 July 2025
  • Accepted 6 November 2025
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