Nonlinear and linear shielding of rare-earth crystal-field interactions

A. J. Freeman*, R. E. Watson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


It was shown previously that significant nonlinear shielding of the rare-earth electrostatic crystalline-field interactions may occur, and hence that the standard parametrization scheme used to determine the crystalfield parameters, VLM=ALMrL, was questionable. These nonlinear effects arise from the same distortions of the closed shells in rare-earth ions which produce the (larger) linear shielding of the crystal field Vc. In this paper, both nonlinear and linear shielding effects have been investigated for the rare-earth ions Ce3+, and Tb3+ through Yb3+ inclusive. The method of single substituted configurations is employed and is shown to avoid the difficulties associated with the traditional single-determinant perturbation-theory approach previously used exclusively by various authors. Results based on both methods are given and compared; significant differences in linear-shielding predictions are found to be introduced by the inexact traditional approach. Calculations for the nonlinear 5p4f effects have been done, and results displayed, as a function of the strength of Vc (based on the point-charge model). The relevance of these effects to experiment is examined qualitatively.

Original languageEnglish (US)
Pages (from-to)A1606-A1615
JournalPhysical Review
Issue number5A
StatePublished - 1965

ASJC Scopus subject areas

  • General Physics and Astronomy


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