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Spin Dynamics of S=1/2 Honeycomb Antiferromagnet

The two-dimensional (2D) frustrated honeycomb Heisenberg antiferromagnet can support several kinds of ground states according to the ratio α = J2/J1. Understanding these states is a central challenge in quantum magnetism.

Research Highlights:

  • Frustrated Lattice: Investigating materials where the honeycomb lattice is realized, such as delafossite-derived Cu5SbO6.
  • Dimer Ground State: Magnetic susceptibility measurements confirm a dimer ground state with a singlet-triplet excitation of ~16 meV.
  • Neutron Spectroscopy: Utilizing inelastic neutron scattering to probe dispersion spectra and extract magnetic interaction parameters.
Spin Dynamics Diagram

Figure: Crystal structure and magnetic connectivity in Cu5SbO6.

By comparing experimental dispersion relations with theoretical models, we can justify whether observations align with predictions of Neel order, plaquette resonating valence bonds, or dimer ground states.