Abstract
Magnetoelastic properties of magnetic oxides can be enhanced by select 3dn transition ions. Spin–orbit coupling can survive in a cubic crystal field where a ground-state orbital triplet degeneracy is split by an axial deformation of the ligands. If the distortion stabilizes a singlet by a Jahn-Teller effect, there is reduced orbital angular momentum, and magnetoelastic effects are less significant; if the doublet is stabilized by a distortion of opposite sign the spin–orbit effect dominates, and the result is a strongly magnetoelastic ion. An analytical solution for the threshold of ligand distortion reversal confirms: (i) that the doublet cannot be stabilized without an exchange field, and (ii) that the smallest allowable ratio of spin-orbit coupling constant to the spontaneous distortion splitting is 2/3, which is reached only in the limit of an infinite exchange field.
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