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Phase transitions in systems with reorienting impurity centres

Phase transitions induced by the quenching of reorientations in a system of impurity centres with adiabatic potentials having several equivalent minima are discussed. In addition to inter-centre coupling the transition temperature depends on the interaction between the impurity and the crystal. The interaction of the impurity electronic states with the crystalline vibration causing the formation of the minima of the adiabatic potential also modifies the density of the crystal vibrations. The latter depends on the impurity reorientation which causes the essential change of the total energy of the crystalline vibrations in the phase transition. The system of Li+-KTaO3 and Jahn-Teller centres in twofold-degenerate electronic states are considered. The possibility of the formation of a Jahn-Teller glass phase is also discussed.