Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo${}_2$(AsO${}_4$)${}_2$

A. Devillez, J. Robert, E. Lhotel +13

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 an…