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 and Nirmal J. Ghimire ()
Additional contact information
Resham Babu Regmi: University of Notre Dame
Hari Bhandari: University of Notre Dame
Bishal Thapa: George Mason University
Yiqing Hao: Oak Ridge National Laboratory
Nileema Sharma: University of Notre Dame
James McKenzie: University of Notre Dame
Xinglong Chen: Argonne National Laboratory
Abhijeet Nayak: University of Notre Dame
Mohamed El Gazzah: University of Notre Dame
Bence G. Márkus: University of Notre Dame
László Forró: University of Notre Dame
Xiaolong Liu: University of Notre Dame
Huibo Cao: Oak Ridge National Laboratory
J. F. Mitchell: Argonne National Laboratory
Igor I. Mazin: George Mason University
Nirmal J. Ghimire: University of Notre Dame

Nature Communications, 2025, vol. 16, issue 1, 1-6

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-58642-4

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