Polarized reflectance data (300–10000 cm−1), their Kramers-Kronig transformation and absorbance spectra (400–4000 cm−1) at room temperature and below the metal-insulator transition at T=135K are reported for α-(BEDT-TTF)2I3. A preliminary analysis of the vibrational behavior of the BEDT-TTF molecule is reported and guides the assignment of the vibronic features to specific intramolecular modes. A microscopic mechanism of vibronically induced electron charge oscillations in the presence of a 2-D network of electron transfer interactions is discussed for the first time and the crystal modes active in this mechanism are sorted out on the basis on symmetry arguments. Some characteristics of the low temperature phase are deduced from the analysis of the low temperature spectra.
Infrared Properties of A 2-d Organic Conductor - Alpha-(bedt-ttf)2i3 In Its High and Low-temperature Phases
MENEGHETTI, MORENO;BOZIO, RENATO;PECILE, CESARE
1987
Abstract
Polarized reflectance data (300–10000 cm−1), their Kramers-Kronig transformation and absorbance spectra (400–4000 cm−1) at room temperature and below the metal-insulator transition at T=135K are reported for α-(BEDT-TTF)2I3. A preliminary analysis of the vibrational behavior of the BEDT-TTF molecule is reported and guides the assignment of the vibronic features to specific intramolecular modes. A microscopic mechanism of vibronically induced electron charge oscillations in the presence of a 2-D network of electron transfer interactions is discussed for the first time and the crystal modes active in this mechanism are sorted out on the basis on symmetry arguments. Some characteristics of the low temperature phase are deduced from the analysis of the low temperature spectra.
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