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Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb4Se8

Author

Listed:
  • Resham Babu Regmi

    (University of Notre Dame
    University of Notre Dame)

  • Hari Bhandari

    (University of Notre Dame
    University of Notre Dame
    George Mason University)

  • Bishal Thapa

    (George Mason University
    George Mason University)

  • Yiqing Hao

    (Oak Ridge National Laboratory)

  • Nileema Sharma

    (University of Notre Dame
    University of Notre Dame)

  • James McKenzie

    (University of Notre Dame
    University of Notre Dame)

  • Xinglong Chen

    (Argonne National Laboratory)

  • Abhijeet Nayak

    (University of Notre Dame
    University of Notre Dame)

  • Mohamed El Gazzah

    (University of Notre Dame
    University of Notre Dame)

  • Bence G. Márkus

    (University of Notre Dame
    University of Notre Dame)

  • László Forró

    (University of Notre Dame
    University of Notre Dame)

  • Xiaolong Liu

    (University of Notre Dame
    University of Notre Dame)

  • Huibo Cao

    (Oak Ridge National Laboratory)

  • J. F. Mitchell

    (Argonne National Laboratory)

  • Igor I. Mazin

    (George Mason University
    George Mason University)

  • Nirmal J. Ghimire

    (University of Notre Dame
    University of Notre Dame)

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.

Suggested Citation

  • 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 & H, 2025. "Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb4Se8," Nature Communications, Nature, vol. 16(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58642-4
    DOI: 10.1038/s41467-025-58642-4
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