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<p>The interplay of charge and spin orders lies at the heart of correlated electron physics and plays a critical role in the emergence of unconventional quantum phases. Kagome magnets provide a particularly promising platform to investigate these phenomena, owing to their geometrically frustrated lattice structure. However, resolving spin and charge orders microscopically and establishing ways to control them remain fundamental challenges. Here, we demonstrate magnetic-field control of an altermagnetic spin density wave order intertwined with charge density wave order in kagome magnet CsCr<sub>3</sub>Sb<sub>5</sub>. Scanning tunneling microscopy down to deep cryogenic temperature of 50 mK reveals two previously unreported charge density wave orders. Density functional theory confirms that one of them, a 4<InlineEquation ID="IEq1"><EquationSource Format="TEX">\({a}_{0}\times \sqrt{3}{a}_{0}\)</EquationSource><EquationSource Format="MATHML"><math><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>×</mo><msqrt><mrow><mn>3</mn></mrow></msqrt><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub></math></EquationSource></InlineEquation> charge order, is coupled to a spin density wave with an altermagnetic ground state. The charge density waves can be tuned in both amplitude and phase by an external magnetic field, reflected in domain switching and stripe sliding of the charge density wave. Our findings deepen the understanding of symmetry-breaking in kagome systems, providing a tunable platform to explore the interplay of electronic correlation with emergent quantum magnetism.</p>

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Controlling an altermagnetic spin density wave in the kagome magnet CsCr3Sb5

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月1日

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  • Zihao Huang,
  • Chenchao Xu,
  • Yande Que,
  • Yi Liu,
  • Yunhao Wang,
  • Shiyu Zhu,
  • Ranjith Shivajirao,
  • Zheng Jue Tong,
  • Amit Kumar,
  • Chao Cao,
  • Guang-Han Cao,
  • Hong-Jun Gao,
  • Bent Weber

摘要

The interplay of charge and spin orders lies at the heart of correlated electron physics and plays a critical role in the emergence of unconventional quantum phases. Kagome magnets provide a particularly promising platform to investigate these phenomena, owing to their geometrically frustrated lattice structure. However, resolving spin and charge orders microscopically and establishing ways to control them remain fundamental challenges. Here, we demonstrate magnetic-field control of an altermagnetic spin density wave order intertwined with charge density wave order in kagome magnet CsCr3Sb5. Scanning tunneling microscopy down to deep cryogenic temperature of 50 mK reveals two previously unreported charge density wave orders. Density functional theory confirms that one of them, a 4\({a}_{0}\times \sqrt{3}{a}_{0}\)a0×3a0 charge order, is coupled to a spin density wave with an altermagnetic ground state. The charge density waves can be tuned in both amplitude and phase by an external magnetic field, reflected in domain switching and stripe sliding of the charge density wave. Our findings deepen the understanding of symmetry-breaking in kagome systems, providing a tunable platform to explore the interplay of electronic correlation with emergent quantum magnetism.