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<p>The cobalt-intercalated transition metal dichalcogenide Co<sub><i>x</i></sub>TaS<sub>2</sub> hosts a rich landscape of magnetic phases that depend sensitively on <i>x</i>. While the stoichiometric compound with <i>x</i> = 1/3 exhibits a single magnetic transition, samples with <i>x</i>≤0.325 display two transitions with an anomalous Hall effect (AHE) emerging in the lower temperature phase. Here, we resolve the spin structure in each phase by employing a suite of magneto-optical probes that include the discovery of anomalous magneto-birefringence: a spontaneous time-reversal sensitive rotation of the principal optic axes. A symmetry-based analysis identifies the AHE-active phase as an anisotropic (2+1)<b>Q</b> state, in which magnetic modulation at one wavevector (<b>Q</b>) differs in symmetry from that at the remaining two. The (2+1)<b>Q</b> state naturally exhibits scalar spin chirality as a mechanism for the AHE and expands the classification of multi-Q magnetic phases.</p>

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Anisotropic multi-Q order in CoxTaS2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Jonathon Kruppe,
  • Josue Rodriguez,
  • Catherine Xu,
  • James Analytis,
  • Joseph Orenstein,
  • Veronika Sunko

摘要

The cobalt-intercalated transition metal dichalcogenide CoxTaS2 hosts a rich landscape of magnetic phases that depend sensitively on x. While the stoichiometric compound with x = 1/3 exhibits a single magnetic transition, samples with x≤0.325 display two transitions with an anomalous Hall effect (AHE) emerging in the lower temperature phase. Here, we resolve the spin structure in each phase by employing a suite of magneto-optical probes that include the discovery of anomalous magneto-birefringence: a spontaneous time-reversal sensitive rotation of the principal optic axes. A symmetry-based analysis identifies the AHE-active phase as an anisotropic (2+1)Q state, in which magnetic modulation at one wavevector (Q) differs in symmetry from that at the remaining two. The (2+1)Q state naturally exhibits scalar spin chirality as a mechanism for the AHE and expands the classification of multi-Q magnetic phases.