Polaron and charge transfer vibronic exciton phenomena in ferroelectrics
| Autor(en): | Vikhnin, VS Kapphan, S Liu, H Jia, W Trepakov, V Jastrabik, L |
Stichwörter: | ABSORPTION-EDGE; charge transfer vibronic exciton; CRYSTALS; ferroelectric oxides; Jahn-Teller polaron; Materials Science; Materials Science, Multidisciplinary; MICRODOMAINS; MULLER PHASE; optical response; ORIGIN; PEROVSKITE-LIKE FERROELECTRICS; phase transition; Physics; Physics, Condensed Matter; SHIFT | Erscheinungsdatum: | 2000 | Herausgeber: | TAYLOR & FRANCIS LTD | Journal: | FERROELECTRICS | Volumen: | 237 | Ausgabe: | 1-4 | Startseite: | 385 | Seitenende: | 392 | Zusammenfassung: | New phenomena induced by Jahn-Teller polarons (JTP) and charge transfer vibronic excitons (CTVE) in ferroelectric oxides are considered. The important role of CTVE was shown in the analysis of the drastic temperature shift of the Fundamental absorption edge in ferroelectric oxides. This effect was explained on the basis of ``band-intermediate radius CTVE'' transitions. The critical increasing of the absolute diffraction efficiency of transient gratings near the ferroelectric phase transition (PT) was predicted and detected in KTN. It was shown that the mechanism of this phenomenon is connected with the excitation of CTVE. A new type of PT in solid solution with double substitution, like (SrTiO3)(x)(KTaO3)(1-x), is proposed. |
Beschreibung: | 9th European Meeting on Ferroelectricity (EMF-9), PRAGUE, CZECH REPUBLIC, JUL 12-16, 1999 |
ISSN: | 00150193 |
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