JAHN-TELLER EFFECTS AND MAGNETISM

Publisher Website
Google Scholar
Abstract
Jahn-Teller instability may appear as a spontaneous distortion of the environment of an ion in a crystal (" static " Jahn-Teller effect) or as a " dynamic " effect in which there is no change in local symmetry and no splitting of degeneracy, but instead a change in the nature of the degenerate states as a result of the vibronic coupling. The resulting changes in the effective Hamiltonian which describes spin-orbit splitting, etc., as well as the response of the system to external perturbations, may be described by introducing appropriate reduction factors into the crystal-field model for the ion. A dynamic Jahn-Teller effect reduces the low-temperature magnetic susceptibility of paramagnetic systems and thus causes departures from the Curie-Weiss law. In the strong-coupling limit, small crystal strains play a crucial role in effecting the transition from dynamic to static Jahn-Teller effect

This publication has 0 references indexed in Scilit: