Abstract
The current experimental and theoretical knowledge of new polaronic-type excitons in ferroelectric oxides—charge transfer vibronic excitons (CTVE)—is discussed. It is shown that Hartree-Fock-type INDO calculations as well as photoluminescence studies in ferroelectric oxygen-octahedral perovskites confirm the CTVE-concept. Single CTVE as well as a new phase of strongly correlated CTVEs are analyzed. It is shown also that polaron- and CTVE-trapping effects including the oxygen vacancy clusters play an important role in polar cluster formation.
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