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Strong Kitaev Interaction in BaCo_{2}(AsO_{4})_{2}.

Pavel A Maksimov1,2, Shengtao Jiang3, L P Regnault4,5

  • 1Joint Institute for Nuclear Research, Bogolyubov Laboratory of Theoretical Physics, Dubna, Moscow region 141980, Russia.

Physical Review Letters
|August 27, 2025
PubMed
Summary
This summary is machine-generated.

A dominant Kitaev interaction was identified in the honeycomb-lattice cobaltate BaCo_{2}(AsO_{4})_{2} using inelastic neutron scattering. This finding explains the material's unique magnetic order and low saturation field.

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • Honeycomb-lattice magnets are candidates for realizing novel quantum states.
  • Understanding magnetic interactions is crucial for designing quantum materials.

Purpose of the Study:

  • To investigate the magnetic interactions in BaCo_{2}(AsO_{4})_{2}.
  • To elucidate the origin of its unusual magnetic properties.

Main Methods:

  • Inelastic neutron scattering experiments.
  • Anisotropic-exchange model development.
  • Density-matrix renormalization group calculations.

Main Results:

  • Unequivocal evidence for a dominant Kitaev interaction in BaCo_{2}(AsO_{4})_{2}.
  • Anisotropic-exchange model successfully reproduces experimental data.
  • Model is consistent with observed double-zigzag magnetic order and low saturation field.

Conclusions:

  • The Kitaev interaction is the primary driver of magnetic behavior in BaCo_{2}(AsO_{4})_{2}.
  • The findings provide insights into quantum magnetism in honeycomb materials.