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Strong Non‐Adiabatic Interactions and Phase Transitions in Conductive Jahn‐Teller Crystals by A. A. Kiselev; A. V. Liaptsev is a Physics and Astronomy article available to read on EtoBox.
What is Strong Non‐Adiabatic Interactions and Phase Transitions in Conductive Jahn‐Teller Crystals about?
## Abstract A model of a conducting crystal composed of quasi‐molecules with D~4h~ symmetry and with nearly degenerate A~1g~ and B~1g~ states is considered. The model Hamiltonian includes intramolecular strong non‐adiabatic interactions, which are non‐diagonal with respect to the electronic quantum numbers and linear (Jahn‐Teller type) and quadratic (Renner‐type) in the vibrational coordinates. The model Hamiltonian is analysed with the help of the mean field method. It is shown that the non‐adiabatic electron‐phonon interaction causes a structural phase transition which splits the degenerate vibrational mode involved in the interaction, the minimum frequency of the lower branch decreasing when the temperature decreases. For the electrons the two‐band BCS equation follows from the calculation, the interaction constant being multiplied by the average number of low‐frequency phonons.
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It is typically read by researchers, students, and practitioners in Physics and Astronomy.
- Author
- A. A. Kiselev; A. V. Liaptsev
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0370-1972)
- Published
- 1992
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)