Abstract
The pair electron-hole Jahn-Teller effect, which is realized on degenerate states of a vibronic Frenkel exciton (VFE) in soft-mode crystals, is considered. It is shown that the vibronic effect in a VFE can be significantly enhanced in crystals having soft lattice modes. The occurrence of strong local order-disorder fluctuations in this situation is predicted. The manifestations of VFEs localized at impurities in soft matrices (Cr3+ in SrTiO3, Fe5+ in KTaO3, and Mn5+ in TbVO4 and TbPO4) are considered. The possibility of fluctuation effects related to VFEs in nominally pure soft-mode crystals (SrTiO3 and BaTiO3) is discussed.
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Original Russian Text © V.S. Vikhnin, E.A. Ruzanova, 2007, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2007, Vol. 71, No. 10, pp. 1411–1415.
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Vikhnin, V.S., Ruzanova, E.A. Vibronic Frenkel exciton in a soft-mode crystal. Bull. Russ. Acad. Sci. Phys. 71, 1375–1379 (2007). https://doi.org/10.3103/S1062873807100103
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DOI: https://doi.org/10.3103/S1062873807100103