Jahn-Teller effects in paramagnetic crystals

A detailed account is given of the theory of the Jahn-Teller effect in crystals containing (3d)ⁿ paramagnetic impurity ions. The importance of using a complete lattice phonon system is emphasized and full details of a particularly useful multi-mode lattice model are presented. Transformation methods are used to simplify the ion-lattice coupling. Full details of the effective Hamiltonian and associated reduction factors are either derived or reviewed for the T?e, T?t, T?(e+t) and E?e systems in cubic and trigonal e environments. An account of the existing literature concerning various aspects of Jahn-Teller theory is also given. Detailed lists of references to experimental data on (3d)ⁿ systems i which Jahn-Teller effects are thought to occur are also presented. The survey is intended to cover the literature comprehensively from 1970 onwards.