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The EPR g factors g ‖ , g ⊥  for Yb 3+  in YBa 2 Cu 3 O 7−δ  are studied with perturbation formulas based on the cluster approach of the spin-Hamiltonian parameters for a 4f 13  ion in tetragonal symmetry. In these formulas, the contributions to the EPR parameters of the covalency effects, the admixture between the J = 7/2 and J = 5/2 states and the second-order perturbation terms are all included. The used crystal-field parameters are calculated with the superposition model and the local structural data of Yb 3+  in YBa 2 Cu 3 O 7−δ  . The resulting EPR g factors for Yb 3+  ions in the superconductor YBa 2 Cu 3 O 7−δ  agree reasonably with the experimental values. The results are discussed.

Theoretical Investigation of the EPR g-factors for Yb 3+ in YBa 2 Cu 3 O 7-δ