Abstract
Vibronic interactions can induce strong admixture by the magnetic field of other states into Kramers doublets leading to strong spin-lattice coupling of the Kramers doublets. The spin-lattice coefficients of the ground ${\ensuremath{\Gamma}}_{7}$ level of ${d}^{9}$ ions in tetrahedral symmetry are calculated in the cases of strong and moderate Jahn-Teller coupling of the $^{2}T_{2}$ state to $E$ modes of vibration. The electron paramagnetic resonance (EPR) of ${\mathrm{Cu}}^{2+}$ and ${\mathrm{Ag}}^{2+}$ in ZnS, ZnSe, and ZnTe is unobserved because of the strong spin-lattice coupling: the internal strains of the crystals are the cause of broadening of EPR lines thus too weak to be detected.
Published Version
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