INVESTIGATIONS ON THE SPIN HAMILTONIAN PARAMETERS FORNd3+INThGeO4

Abstract

The spin Hamiltonian parameters, g factors g‖and g⊥, for Nd3+in ThGeO4are theoretically investigated from the perturbation formulas of the g factors for a 4f3ion in tetragonal symmetry. In these formulas, the contributions to the g factors from the second-order perturbation terms and the admixture of various states are taken into account. It is found that the calculated g factors of this work are smaller than the experimental results, but close to those in the previous theoretical studies by Gutowska et al. Moreover, the calculated hyperfine structure constants A‖and A⊥as well as the energies of the4I9/2Stark levels in this work are also consistent with those in the previous investigations. The discrepancy between theoretical and experimental g factors is discussed.