The dynamic Jahn-Teller effect of an electronic Γ8quartet resulting from strong coupling to Γ5lattice modes in the fine structure of Er3+in Pd-Er

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Abstract
An investigation has been undertaken to determine whether the EPR field for resonance results of Devine et al. (see Solid St. Commun. vol.11, p.233 (1972) and Phys. Lett. A, vol.41, p.11 (1972)) for Er3+ in Pd-Er, could be interpreted without introducing static lattice displacements from the cubic symmetry of pure Pd. No static trigonal distortion was present as some authors have assumed. The ground electronic state of the erbium ion was assumed to be a Gamma 8 quartet which was deliberately not coupled to other electronic states of higher energy. This Gamma 8 has been coupled to a particular set of Gamma 5 lattice modes and studied in the strong-coupled limit with anharmonic vibrational energies of the modes included. If a dynamic Jahn-Teller effect takes place then it is shown that in addition to predicting the correct angular dependence of the five observed lines, in the limit of strong anharmonicity, it is possible to reproduce the splitting of one of the EPR lines in the regimes of strong and weak inversion splitting.

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