Abstract
In crystals containing ions with orbitally degenerate ground state, the interactions of the electron orbitals with the ligand displacements have a destabilizing effect on the ionic configuration: Jahn-Teller (JT) effect. This provides a mechanism for structural phase transitions in crystals which would be stable in the absence of electron-ion interaction. We give an introduction into the theory of such JT-induced transitions, with particular emphasis on a classification of the various types of JT-coupling and their dynamic characteristics. The dynamics of the cooperative JT effect manifests itself in bands of collective vibronic modes arising from transitions between low-lying vibronic levels of the JT complexes, and an analysis of the collective dynamic behaviour requires a thorough understanding of the vibronic excitations of a single JT complex.
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Thomas, H. (1977). Theory of Jahn-Teller Transitions. In: Riste, T. (eds) Electron-Phonon Interactions and Phase Transitions. NATO Advanced Study Institutes Series, vol 29. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8921-1_15
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DOI: https://doi.org/10.1007/978-1-4615-8921-1_15
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