Proprietes magnetiques d'echantillons polycristallins de CrWO4

The study of the temperature dependence of EPR and Mössbauer spectra on polycristalline samples of CrWO₄, pure and doped with small quantities of ⁵⁷Fe, shows the presence of an antiferro-paramagnetic transition between 40 and 45 K. The magnetic susceptibility displays a broad maxium at a higher temperature ($\text{T}{}_{\max }\text{? 100}\text{K}$). The crystal structure suggests a monodimensional magnetic system but a simple model of linear chains with Heisenberg exchange does not fit the experimental data. Non-negligible interchain exchange and/or some anisotropy in the intrachain magnetic interactions could be responsible for this discrepancy.