Anisotropic multi-Q order in CoxTaS2
Kruppe J, Rodriguez J, Xu C, Analytis J, Orenstein J, Sunko V. 2026. Anisotropic multi-Q order in CoxTaS2. npj Quantum Materials., 2507.12588.
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Author
Kruppe, Jonathon;
Rodriguez, Josue;
Xu, Catherine;
Analytis, James;
Orenstein, Joseph;
Sunko, VeronikaISTA 
Corresponding author has ISTA affiliation
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Abstract
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.
Publishing Year
Date Published
2026-04-09
Journal Title
npj Quantum Materials
Publisher
Springer Nature
Acknowledgement
We thank Linda Ye and Yue Sun for helpful discussion. Experimental and theoretical work at LBNL and UC Berkeley was funded by the Quantum Materials (KC2202) program under the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05CH11231. V.S. and J.O. received support from the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4537 to J.O. at UC Berkeley. J.K. received support from the National Science Foundation Graduate Research Fellowship Program under Grant No. 2146752. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. During the preparation of this manuscript, we became aware of the following related work: refs. 56,57,58.
Article Number
2507.12588
eISSN
IST-REx-ID
Cite this
Kruppe J, Rodriguez J, Xu C, Analytis J, Orenstein J, Sunko V. Anisotropic multi-Q order in CoxTaS2. npj Quantum Materials. 2026. doi:10.1038/s41535-026-00856-w
Kruppe, J., Rodriguez, J., Xu, C., Analytis, J., Orenstein, J., & Sunko, V. (2026). Anisotropic multi-Q order in CoxTaS2. Npj Quantum Materials. Springer Nature. https://doi.org/10.1038/s41535-026-00856-w
Kruppe, Jonathon, Josue Rodriguez, Catherine Xu, James Analytis, Joseph Orenstein, and Veronika Sunko. “Anisotropic Multi-Q Order in CoxTaS2.” Npj Quantum Materials. Springer Nature, 2026. https://doi.org/10.1038/s41535-026-00856-w.
J. Kruppe, J. Rodriguez, C. Xu, J. Analytis, J. Orenstein, and V. Sunko, “Anisotropic multi-Q order in CoxTaS2,” npj Quantum Materials. Springer Nature, 2026.
Kruppe J, Rodriguez J, Xu C, Analytis J, Orenstein J, Sunko V. 2026. Anisotropic multi-Q order in CoxTaS2. npj Quantum Materials., 2507.12588.
Kruppe, Jonathon, et al. “Anisotropic Multi-Q Order in CoxTaS2.” Npj Quantum Materials, 2507.12588, Springer Nature, 2026, doi:10.1038/s41535-026-00856-w.
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