Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo$_2$(AsO$_4$)$_2$
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912733317824512 |
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| author | Devillez, A. Robert, J. Lhotel, E. Ballou, R. Cavenel, C. Romero, F. Denis Faure, Q. Jacobsen, H. Lass, J. Mazzone, D. G. Hansen, U. Bengaard Enderle, M. Raymond, S. De Brion, S. Simonet, V. Songvilay, M. |
| author_facet | Devillez, A. Robert, J. Lhotel, E. Ballou, R. Cavenel, C. Romero, F. Denis Faure, Q. Jacobsen, H. Lass, J. Mazzone, D. G. Hansen, U. Bengaard Enderle, M. Raymond, S. De Brion, S. Simonet, V. Songvilay, M. |
| contents | The ground state and Hamiltonian of the honeycomb lattice material BaCo$_{2}$(AsO$_{4}$)$_{2}$ hosting magnetic Co$^{2+}$, have been debated for decades. The recent proposal for anisotropic bond-dependent interactions in such honeycomb cobaltates has raised the prospect of revisiting its Hamiltonian in the context of Kitaev physics. To test this hypothesis, we have combined magnetization, ac-susceptibility and neutron scattering measurements on a BaCo$_{2}$(AsO$_{4}$)$_{2}$ single-crystal, together with advanced modeling. Our experimental results highlight a collinear magnetic ground state with intrinsic disorder associated to an average incommensurate propagation vector. Monte Carlo simulations and linear spin wave calculations were performed to obtain a spin model compatible with this unusual ground state, the dispersion of magnetic excitations and a magnetization plateau under magnetic field. We thus show that bond-dependent anisotropic interactions, including Kitaev-like interactions, are necessary to account for the puzzling properties of this long-explored material, and are hence a general ingredient in the cobaltates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_22300 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo$_2$(AsO$_4$)$_2$ Devillez, A. Robert, J. Lhotel, E. Ballou, R. Cavenel, C. Romero, F. Denis Faure, Q. Jacobsen, H. Lass, J. Mazzone, D. G. Hansen, U. Bengaard Enderle, M. Raymond, S. De Brion, S. Simonet, V. Songvilay, M. Strongly Correlated Electrons The ground state and Hamiltonian of the honeycomb lattice material BaCo$_{2}$(AsO$_{4}$)$_{2}$ hosting magnetic Co$^{2+}$, have been debated for decades. The recent proposal for anisotropic bond-dependent interactions in such honeycomb cobaltates has raised the prospect of revisiting its Hamiltonian in the context of Kitaev physics. To test this hypothesis, we have combined magnetization, ac-susceptibility and neutron scattering measurements on a BaCo$_{2}$(AsO$_{4}$)$_{2}$ single-crystal, together with advanced modeling. Our experimental results highlight a collinear magnetic ground state with intrinsic disorder associated to an average incommensurate propagation vector. Monte Carlo simulations and linear spin wave calculations were performed to obtain a spin model compatible with this unusual ground state, the dispersion of magnetic excitations and a magnetization plateau under magnetic field. We thus show that bond-dependent anisotropic interactions, including Kitaev-like interactions, are necessary to account for the puzzling properties of this long-explored material, and are hence a general ingredient in the cobaltates. |
| title | Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo$_2$(AsO$_4$)$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.22300 |