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<p>Reducing magnetic domain size to the nanoscale can generate unconventional with short-range magnetic phases, such as spin-glass states, Griffiths phase, and superparamagnetism. Here, we report the synthesis of a two-dimensional magnet, Cr<sub><i>x</i></sub>Pt<sub>1<i>−x</i></sub>Te<sub>2</sub>, using the self-flux method. Magnetization and anomalous Hall effect (AHE) measurements reveal a canonical temperature-dependent evolution from a blocked superparamagnetic state at low temperature to a superparamagnetic state at intermediate temperature and a paramagnetic state at high temperature. Scanning transmission electron microscopy with magnetization analyses based on the Langevin function demonstrates that the superparamagnetism arises from the formation of magnetic nanoclusters induced by Cr doping within the PtTe<sub>2</sub> lattice. Importantly, the AHE cannot be well described by conventional scaling laws developed for long-range ordered magnetic systems. This motivates a phenomenological framework based on multiple competing scattering mechanisms, where the blocking dynamics of magnetic nanoclusters governs the AHE. These findings enhance our understanding of superparamagnetism in Cr<sub><i>x</i></sub>Pt<sub>1<i>−x</i></sub>Te<sub>2</sub> and motivate the development of theoretical models for short-range ordered magnetism.</p>

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Emergent superparamagnetism and anomalous Hall effect in two-dimensional magnet CrxPt1-xTe2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月25日

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  • Xue Yang,
  • Ruihuan Duan,
  • Xin Zhou,
  • Yuqiao Zhou,
  • Lei Xu,
  • Sicheng Zhou,
  • Xinyi Zheng,
  • Siyuan Zhou,
  • Lihong Hu,
  • Hua Ke,
  • Bingbing Tong,
  • Jie Shen,
  • Zhaozheng Lyu,
  • Xiunian Jing,
  • Fanming Qu,
  • Peiling Li,
  • Zheng Liu,
  • Guangtong Liu,
  • Li Lu

摘要

Reducing magnetic domain size to the nanoscale can generate unconventional with short-range magnetic phases, such as spin-glass states, Griffiths phase, and superparamagnetism. Here, we report the synthesis of a two-dimensional magnet, CrxPt1−xTe2, using the self-flux method. Magnetization and anomalous Hall effect (AHE) measurements reveal a canonical temperature-dependent evolution from a blocked superparamagnetic state at low temperature to a superparamagnetic state at intermediate temperature and a paramagnetic state at high temperature. Scanning transmission electron microscopy with magnetization analyses based on the Langevin function demonstrates that the superparamagnetism arises from the formation of magnetic nanoclusters induced by Cr doping within the PtTe2 lattice. Importantly, the AHE cannot be well described by conventional scaling laws developed for long-range ordered magnetic systems. This motivates a phenomenological framework based on multiple competing scattering mechanisms, where the blocking dynamics of magnetic nanoclusters governs the AHE. These findings enhance our understanding of superparamagnetism in CrxPt1−xTe2 and motivate the development of theoretical models for short-range ordered magnetism.