Anhydrous cuprous chloride: The paramagnetic phase

Anhydrous cuprous chloride is monoclinic, space group: C 2/m. We can consider it as being a layered compound consisting of pseudohexagonal layers in the (001) plane. Nevertheless, the symmetry deviation and the uncommon position of the pseudohexagonal environment symmetry axis do not lead to a unaxial anisotropy, contrary to the case of CuF₂ · 2H₂O. If we compare the experimental results with the isotropic quadratic 2d planar Heisenberg model with spin $\text{1}\text{2}$ (lines [1], we find $\text{J}\text{k}\text{= 37}\text{K}$, with J the antiferromagnetic exchange integral.