Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb4Se8

Resham Babu Regmi; Hari Bhandari; Bishal Thapa; Yiqing Hao; Nileema Sharma; James McKenzie; Xinglong Chen; Abhijeet Nayak; Mohamed El Gazzah; Bence G. Márkus; László Forró; Xiaolong Liu; Huibo Cao; J. F. Mitchell; Igor I. Mazin; Nirmal J. Ghimire

doi:10.1038/s41467-025-58642-4

Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb₄Se₈

Resham Babu Regmi
, Hari Bhandari
, Bishal Thapa
, Yiqing Hao
, Nileema Sharma
, James McKenzie
, Xinglong Chen
, Abhijeet Nayak
, Mohamed El Gazzah
, Bence G. Márkus
, László Forró
, Xiaolong Liu
, Huibo Cao
, J. F. Mitchell
, Igor I. Mazin
, Nirmal J. Ghimire

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Altermagnets (AMs) are a new class of magnetic materials that combine the beneficial spintronics properties of ferromagnets and antiferromagnets, garnering significant attention recently. Here, we have identified altermagnetism in a layered intercalated transition metal diselenide, CoNb₄Se₈, which crystallizes with an ordered sublattice of intercalated Co atoms between NbSe₂ layers. Single crystals are synthesized, and the structural characterizations are performed using single crystal diffraction and scanning tunneling microscopy. Magnetic measurements reveal easy-axis antiferromagnetism below 168 K. Density functional theory (DFT) calculations indicate that A-type antiferromagnetic ordering with easy-axis spin direction is the ground state, which is verified through single crystal neutron diffraction experiments. Electronic band structure calculations in this magnetic state display spin-split bands, confirming altermagnetism in this compound. The layered structure of CoNb₄Se₈ presents a promising platform for testing various predicted properties associated with altermagnetism.

Original language	English
Article number	4399
Journal	Nature Communications
Volume	16
Issue number	1
DOIs	https://doi.org/10.1038/s41467-025-58642-4
State	Published - Dec 2025

Funding

N.J.G., R.B.R., and I.I.M. were supported by Army Research Office under Cooperative Agreement Number W911NF- 22-2-0173. Work at Argonne National Laboratory (SC-XRD) was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. N. S. acknowledges support from a Materials Science and Engineering Fellowship. H.C. acknowledges the support from U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract No. DE-AC05-00OR22725. This research used resources at the High Flux Isotope Reactor, the DOE Office of Science User Facility, operated by Oak Ridge National Laboratory. X.L. acknowledges support from a Ralph E. Powe Junior Faculty Enhancement Award from ORAU. The authors thank Xinyu Liu for the help with measuring magnetic susceptibility.

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Regmi, R. B., Bhandari, H., Thapa, B., Hao, Y., Sharma, N., McKenzie, J., Chen, X., Nayak, A., El Gazzah, M., Márkus, B. G., Forró, L., Liu, X., Cao, H., Mitchell, J. F., Mazin, I. I., & Ghimire, N. J. (2025). Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb₄Se₈. Nature Communications, 16(1), Article 4399. https://doi.org/10.1038/s41467-025-58642-4

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title = "Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb4Se8",

abstract = "Altermagnets (AMs) are a new class of magnetic materials that combine the beneficial spintronics properties of ferromagnets and antiferromagnets, garnering significant attention recently. Here, we have identified altermagnetism in a layered intercalated transition metal diselenide, CoNb4Se8, which crystallizes with an ordered sublattice of intercalated Co atoms between NbSe2 layers. Single crystals are synthesized, and the structural characterizations are performed using single crystal diffraction and scanning tunneling microscopy. Magnetic measurements reveal easy-axis antiferromagnetism below 168 K. Density functional theory (DFT) calculations indicate that A-type antiferromagnetic ordering with easy-axis spin direction is the ground state, which is verified through single crystal neutron diffraction experiments. Electronic band structure calculations in this magnetic state display spin-split bands, confirming altermagnetism in this compound. The layered structure of CoNb4Se8 presents a promising platform for testing various predicted properties associated with altermagnetism.",

author = "Regmi, \{Resham Babu\} and Hari Bhandari and Bishal Thapa and Yiqing Hao and Nileema Sharma and James McKenzie and Xinglong Chen and Abhijeet Nayak and \{El Gazzah\}, Mohamed and M{\'a}rkus, \{Bence G.\} and L{\'a}szl{\'o} Forr{\'o} and Xiaolong Liu and Huibo Cao and Mitchell, \{J. F.\} and Mazin, \{Igor I.\} and Ghimire, \{Nirmal J.\}",

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AU - McKenzie, James

AU - Chen, Xinglong

AU - Nayak, Abhijeet

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AU - Márkus, Bence G.

AU - Forró, László

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N2 - Altermagnets (AMs) are a new class of magnetic materials that combine the beneficial spintronics properties of ferromagnets and antiferromagnets, garnering significant attention recently. Here, we have identified altermagnetism in a layered intercalated transition metal diselenide, CoNb4Se8, which crystallizes with an ordered sublattice of intercalated Co atoms between NbSe2 layers. Single crystals are synthesized, and the structural characterizations are performed using single crystal diffraction and scanning tunneling microscopy. Magnetic measurements reveal easy-axis antiferromagnetism below 168 K. Density functional theory (DFT) calculations indicate that A-type antiferromagnetic ordering with easy-axis spin direction is the ground state, which is verified through single crystal neutron diffraction experiments. Electronic band structure calculations in this magnetic state display spin-split bands, confirming altermagnetism in this compound. The layered structure of CoNb4Se8 presents a promising platform for testing various predicted properties associated with altermagnetism.

AB - Altermagnets (AMs) are a new class of magnetic materials that combine the beneficial spintronics properties of ferromagnets and antiferromagnets, garnering significant attention recently. Here, we have identified altermagnetism in a layered intercalated transition metal diselenide, CoNb4Se8, which crystallizes with an ordered sublattice of intercalated Co atoms between NbSe2 layers. Single crystals are synthesized, and the structural characterizations are performed using single crystal diffraction and scanning tunneling microscopy. Magnetic measurements reveal easy-axis antiferromagnetism below 168 K. Density functional theory (DFT) calculations indicate that A-type antiferromagnetic ordering with easy-axis spin direction is the ground state, which is verified through single crystal neutron diffraction experiments. Electronic band structure calculations in this magnetic state display spin-split bands, confirming altermagnetism in this compound. The layered structure of CoNb4Se8 presents a promising platform for testing various predicted properties associated with altermagnetism.

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Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb₄Se₈

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