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Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system

Author

Listed:
  • Bin Gao

    (Rice University)

  • Tong Chen

    (Rice University
    Johns Hopkins University)

  • Xiao-Chuan Wu

    (University of California)

  • Michael Flynn

    (University of California
    Boston University)

  • Chunruo Duan

    (Rice University)

  • Lebing Chen

    (Rice University)

  • Chien-Lung Huang

    (Rice University
    National Cheng Kung University)

  • Jesse Liebman

    (Rice University
    Johns Hopkins University)

  • Shuyi Li

    (Rice University)

  • Feng Ye

    (Oak Ridge National Laboratory)

  • Matthew B. Stone

    (Oak Ridge National Laboratory)

  • Andrey Podlesnyak

    (Oak Ridge National Laboratory)

  • Douglas L. Abernathy

    (Oak Ridge National Laboratory)

  • Devashibhai T. Adroja

    (Rutherford Appleton Laboratory)

  • Manh Duc Le

    (Rutherford Appleton Laboratory)

  • Qingzhen Huang

    (National Institute of Standards and Technology)

  • Andriy H. Nevidomskyy

    (Rice University)

  • Emilia Morosan

    (Rice University)

  • Leon Balents

    (University of California
    Canadian Institute for Advanced Research)

  • Pengcheng Dai

    (Rice University)

Abstract

Magnetic order in most materials occurs when magnetic ions with finite moments arrange in a particular pattern below the ordering temperature. Intriguingly, if the crystal electric field (CEF) effect results in a spin-singlet ground state, a magnetic order can still occur due to the exchange interactions between neighboring ions admixing the excited CEF levels. The magnetic excitations in such a state are spin excitons generally dispersionless in reciprocal space. Here we use neutron scattering to study stoichiometric Ni2Mo3O8, where Ni2+ ions form a bipartite honeycomb lattice comprised of two triangular lattices, with ions subject to the tetrahedral and octahedral crystalline environment, respectively. We find that in both types of ions, the CEF excitations have nonmagnetic singlet ground states, yet the material has magnetic order. Furthermore, CEF spin excitons from the tetrahedral sites form a dispersive diffusive pattern around the Brillouin zone boundary, likely due to spin entanglement and geometric frustrations.

Suggested Citation

  • Bin Gao & Tong Chen & Xiao-Chuan Wu & Michael Flynn & Chunruo Duan & Lebing Chen & Chien-Lung Huang & Jesse Liebman & Shuyi Li & Feng Ye & Matthew B. Stone & Andrey Podlesnyak & Douglas L. Abernathy &, 2023. "Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37669-5
    DOI: 10.1038/s41467-023-37669-5
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    References listed on IDEAS

    as
    1. Leon Balents, 2010. "Spin liquids in frustrated magnets," Nature, Nature, vol. 464(7286), pages 199-208, March.
    2. M. Elliot & P. A. McClarty & D. Prabhakaran & R. D. Johnson & H. C. Walker & P. Manuel & R. Coldea, 2021. "Order-by-disorder from bond-dependent exchange and intensity signature of nodal quasiparticles in a honeycomb cobaltate," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
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