BaCo$_2$(AsO$_4$)$_2$: Strong Kitaev, After All

Pavel A. Maksimov; Shengtao Jiang; L. P. Regnault; A. L. Chernyshev

doi:10.1103/k1gq-k8m7

BaCo$_2$(AsO$_4$)$_2$: Strong Kitaev, After All

Strongly Correlated Electrons 2025-08-08 v5

Authors: Pavel A. Maksimov , Shengtao Jiang , L. P. Regnault , A. L. Chernyshev

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Abstract

The inelastic neutron scattering results and their analysis unequivocally point to a dominant Kitaev interaction in the honeycomb-lattice cobaltate BaCo $_2$ (AsO $_4$ ) $_2$ . Our anisotropic-exchange model closely describes $all$ available neutron scattering data in the material's field-polarized phase. The density-matrix renormalization group results for our model are in close accord with the unusual double-zigzag magnetic order and the low in-plane saturation field of BaCo $_2$ (AsO $_4$ ) $_2$ .

Keywords

Kitaev interaction honeycomb lattice neutron scattering magnetic order anisotropic exchange

Cite

@article{arxiv.2503.20859,
  title  = {BaCo$_2$(AsO$_4$)$_2$: Strong Kitaev, After All},
  author = {Pavel A. Maksimov and Shengtao Jiang and L. P. Regnault and A. L. Chernyshev},
  journal= {arXiv preprint arXiv:2503.20859},
  year   = {2025}
}

Comments

9+7.25 pages, 7+11 figures. 50-year-old mystery. Solved. Text of immense persuasive power. Published under different title. Winner of the PRL beauty award (Editor's Suggestion)

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