Abstract
AbstractThe spin‐Hamiltonian parameters g factors g‖, g⟂ and hyperfine structure parameters A‖ and A⟂ for Er3+ (167Er) in CaWO4 and SrWO4 are theoretically studied by using the perturbation formulas of the spin‐Hamiltonian parameters for a 4f11 ion in tetragonal symmetry. In these formulas, the contributions to the spin‐Hamiltonian parameters arising from the second‐order perturbation terms and the admixture of various states are considered. The crystal‐field parameters for the tetragonally distorted tetrahedra are calculated from the superposition model and the local structural data of the impurity Er3+ ions at the host Ca2+ and Sr2+ sites. The theoretical parameters are in agreement with the experimental values. The validity of the results is discussed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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