Fig. 9.

(A) In-plane angle-dependent magnetization for ${\mathrm{BaCo}}_2{({\mathrm{AsO}}_4)}_2$ measured on a small single crystal sample. The red (blue) curve corresponds to a field orientation along the $\widehat{\mathbf{x}}$ -axis ( $\widehat{\mathbf{y}}$ -axis) as depicted in the inset. For clarity, the magnetization curves are shown only for an increasing field from 0 T. (B) Magnetization curves calculated using Monte Carlo methods for the XXZ $\text{-}{J}_1\text{-}{J}_3$ model with the set of exchange parameters given in ( 13 ) at a temperature of T = 0.695 K and (C) for the $\mathrm{JK}\mathrm{\Gamma }{\mathrm{\Gamma }}^{\prime }$ model with the parameter set in ( 14 ) (T = 0 K).