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Order-by-disorder from bond-dependent exchange and intensity signature of nodal quasiparticles in a honeycomb cobaltate

Author

Listed:
  • M. Elliot

    (University of Oxford)

  • P. A. McClarty

    (Max Planck Institute for the Physics of Complex Systems)

  • D. Prabhakaran

    (University of Oxford)

  • R. D. Johnson

    (University College London)

  • H. C. Walker

    (Rutherford Appleton Laboratory-STFC)

  • P. Manuel

    (Rutherford Appleton Laboratory-STFC)

  • R. Coldea

    (University of Oxford)

Abstract

Recent theoretical proposals have argued that cobaltates with edge-sharing octahedral coordination can have significant bond-dependent exchange couplings thus offering a platform in 3d ions for such physics beyond the much-explored realisations in 4d and 5d materials. Here we present high-resolution inelastic neutron scattering data within the magnetically ordered phase of the stacked honeycomb magnet CoTiO3 revealing the presence of a finite energy gap and demonstrate that this implies the presence of bond-dependent anisotropic couplings. We also show through an extensive theoretical analysis that the gap further implies the existence of a quantum order-by-disorder mechanism that, in this material, crucially involves virtual crystal field fluctuations. Our data also provide an experimental observation of a universal winding of the scattering intensity in angular scans around linear band-touching points for both magnons and dispersive spin-orbit excitons, which is directly related to the non-trivial topology of the quasiparticle wavefunction in momentum space near nodal points.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23851-0
    DOI: 10.1038/s41467-021-23851-0
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    Cited by:

    1. M. dos Santos Dias & N. Biniskos & F. J. dos Santos & K. Schmalzl & J. Persson & F. Bourdarot & N. Marzari & S. Blügel & T. Brückel & S. Lounis, 2023. "Topological magnons driven by the Dzyaloshinskii-Moriya interaction in the centrosymmetric ferromagnet Mn5Ge3," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. 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.

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