We report the crystal field levels of several newly-discovered rare-earth kagome compounds: $\rm{ Nd_3Sb_3Mg_2O_{ 14}}$, $\rm{ Nd_3Sb_3Zn_2O_{ 14}}$, and $\rm{ Pr_3Sb_3Mg_2O_{ 14}}$. We determine the CEF Hamiltonian by fitting to neutron scattering data using a point-charge Hamiltonian as an intermediate fitting step. The fitted Hamiltonians accurately reproduce bulk susceptibility measurements, and the results indicate easy-axis ground state doublets for $\rm{ Nd_3Sb_3Mg_2O_{ 14}}$ and $\rm{ Nd_3Sb_3Zn_2O_{ 14}}$, and a singlet ground state for $\rm{ Pr_3Sb_3Mg_2O_{ 14}}$. These results provide the groundwork for future investigations of these compounds and a template for CEF analysis of other low-symmetry materials.
Categories: cond-mat.str-el