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<p>Precise tuning of the Fermi level in topological magnetic materials is essential for optimizing electronic properties, yet conventional doping methods often degrade structural integrity and magnetic order. Here, we achieve controlled electron doping in Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> via non-stoichiometric substitution in Co<sub>3+x</sub>Sn<sub>2-x</sub>S<sub>2</sub> (0 ≤ x ≤ 0.3), preserving the Kagome lattice while enhancing transport properties. This method shifts the Fermi level upward close to the Weyl nodes, leading to a crossover from hole to electron conduction at 2 K. The x = 0.27 sample exhibits a giant transverse magnetoresistance (MR) of 1150% and ultra-high carrier mobility of 18,000 cm²V⁻¹s⁻¹, surpassing conventional magnetic Weyl semimetals. Our findings highlight the role of non-stoichiometric doping in optimizing topological electronic states, positioning Co<sub>3+x</sub>Sn<sub>2-x</sub>S<sub>2</sub> as a promising candidate for spintronic and quantum transport applications.</p>

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Enhancing magnetoresistance and mobility in Co3+xSn2-xS2 via non-stoichiometric doping for fermi level engineering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月14日

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  • Dilanath Adhikari,
  • Yusuff Adeyemi Salawu,
  • Jun Zhou,
  • Yuwaraj K. Kshetri,
  • Nak-Kwan Chung,
  • Young Hwa Jung,
  • Heon-Jung Kim

摘要

Precise tuning of the Fermi level in topological magnetic materials is essential for optimizing electronic properties, yet conventional doping methods often degrade structural integrity and magnetic order. Here, we achieve controlled electron doping in Co3Sn2S2 via non-stoichiometric substitution in Co3+xSn2-xS2 (0 ≤ x ≤ 0.3), preserving the Kagome lattice while enhancing transport properties. This method shifts the Fermi level upward close to the Weyl nodes, leading to a crossover from hole to electron conduction at 2 K. The x = 0.27 sample exhibits a giant transverse magnetoresistance (MR) of 1150% and ultra-high carrier mobility of 18,000 cm²V⁻¹s⁻¹, surpassing conventional magnetic Weyl semimetals. Our findings highlight the role of non-stoichiometric doping in optimizing topological electronic states, positioning Co3+xSn2-xS2 as a promising candidate for spintronic and quantum transport applications.