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VOLUME 59 (1994) | ISSUE 1 | PAGE 46
Mechanism for nonuniform broadening of the NMR spectrum of orbitally degenerate centers in crystals with mixed-valence ions
A mechanism is proposed for the nonuniform broadening of the NMR spectrum of Jahn-Teller centers formed by mixed-valence ions. The effect stems from a nonuniform distribution of the net charge and of the spin density among the various nuclei of the impurity center upon the splitting of a degenerate term in the random crystal fields. This broadening is governed by isotropic hyperfine interactions and is distinct from the conventional mechanisms, which stem from anisotropic hyperfine interactions at Jahn-Teller ions.