Tests of orbit–lattice interaction models using spin–lattice relaxation data of Er3+, Dy3+, and Yb3+ in Cs2NaYCl6

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Abstract
Measurements of the electron spin–lattice relaxation rate are reported for Er3+, Dy3+, and Yb3+ in the cubic host Cs2NaYCl6. Expressions for the anisotropic direct relaxation rates of the respective Γ8 and Γ6 ground states are given in terms of the eleven coupling parameters of the dynamic orbit–lattice interaction for octahedrally coordinated rare earths. Experimental direct process relaxation data are used to test the predictions of three models: (1) the electrostatic model of Buisson and Borg, (2) a nearest neighbor, effective point charge model, and (3) the nearest neighbor superposition model of Newman and co‐workers. None of these proves satisfactory in providing a self‐consistent explanation of the data from all three ions.