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Large off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet

Author

Listed:
  • Xianghan Xu

    (Princeton University)

  • Yiqing Hao

    (Oak Ridge National Laboratory)

  • Shiyu Peng

    (Hong Kong University of Science and Technology)

  • Qiang Zhang

    (Oak Ridge National Laboratory)

  • Danrui Ni

    (Princeton University)

  • Chen Yang

    (Princeton University)

  • Xi Dai

    (Hong Kong University of Science and Technology)

  • Huibo Cao

    (Oak Ridge National Laboratory)

  • R. J. Cava

    (Princeton University)

Abstract

Magnetic toroidicity is an uncommon type of magnetic structure in solid-state materials. Here, we experimentally demonstrate that collinear spins in a material with R-3 lattice symmetry can host a significant magnetic toroidicity, even parallel to the ordered spins. Taking advantage of a single crystal sample of CoTe6O13 with an R-3 space group and a Co2+ triangular sublattice, temperature-dependent magnetic, thermodynamic, and neutron diffraction results reveal A-type antiferromagnetic order below 19.5 K, with magnetic point group -3′ and k = (0,0,0). Our symmetry analysis suggests that the missing mirror symmetry in the lattice could lead to the local spin canting for a toroidal moment along the c axis. Experimentally, we observe a large off-diagonal magnetoelectric coefficient of 41.2 ps/m that evidences the magnetic toroidicity. In addition, the paramagnetic state exhibits a large effective moment per Co2+, indicating that the magnetic moment in CoTe6O13 has a significant orbital contribution. CoTe6O13 embodies an excellent opportunity for the study of next-generation functional magnetoelectric materials.

Suggested Citation

  • Xianghan Xu & Yiqing Hao & Shiyu Peng & Qiang Zhang & Danrui Ni & Chen Yang & Xi Dai & Huibo Cao & R. J. Cava, 2023. "Large off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43858-z
    DOI: 10.1038/s41467-023-43858-z
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